A v ia t i o n

E l ec t r o n i c s

G l o s s a r y

A E VIatIon LECTRONICS

G lossary

How to Speak Avionics-ese*

C G o n ten ts of l oss ar y

A ........................................... 2. N ......................................... 76

B ......................................... 15. O ........................................ 80

C ......................................... 18. P ......................................... 83

D ......................................... 28. Q ........................................ 91

E ......................................... 36. R ......................................... 92

F ......................................... 43. S ......................................... 99

G .

....................................... 49. T ........................................110

H ......................................... 53. U ........................................119

I .......................................... 56. V ....................................... 121

J ......................................... 62. W ...................................... 126

K ......................................... 63. X ....................................... 128

L ......................................... 63. Y ....................................... 129

M .

....................................... 67. Z ....................................... 129

_

The.impending.low.speed.stall.speed..xx.is. _.xxV(ss)

typically.a.number.between.0.06.and.0.10..1.06.

of.stick.shaker.speed.would.be.an.example.

Target.approach.speed.indicator..1.3.of.stick. _.3V(ss)

shaker.speed.

Three.or.four.dimension 3-D, 4-D

The.octal.base,.four-digit.code.used.between. 4096 Code

framing.pulses.of.a.reply.to.identify.the.aircraft.or.

for.general.use.and.emergency.codes.(XPD)

10.Mbps.base.band.data.transmission.over. _0 Base T

twisted.copper.wire

(.1.).Auto.tuned.NAVAID.. A

(.2.).Amperes..

(.3.).Aileron.. ( 4 ) At or Above (Altitude Suffix)

Advanced.Surface.Movement.Guidance.and. A-SMGCS

Control.System

ARINC.661 A66_

Aeronautical.Administrative.Communications AAC

Assigned.Altitude.Deviation AAD

Airline.Avionics.Institute AAI

Above.Aerodome.Level AAL

Advanced.Architecture.Micro-Processor AAMP

Aviation and Air Traffic Services AATS

Advanced.Aviation.Transportation.Technology AATT

Autobrake A/B

ARINC.429.Bus.Emulator ABE

Asynchronous.Balanced.Mode ABM

(.1.).Aeronautical.Binary.Phase.Shift.Keying.. A-BPSK

(.2.).Aviation.Binary.Phase.Shift.Keying

Abbreviation ABRV

Absolute ABS

(.1.).Advisory.Circular.. AC

(.2.).Alternating.Current

_

Aircraft A/C

Address.Compression.Algorithm ACA

Air-Cooled.Air.Cooler ACAC

Airborne.Collision.Avoidance.System ACAS

Aircraft.Communications.Addressing.and. ACARS

Reporting.System

Polled.Mode.An.ACARS.mode.of.operation.in. ACARS

which.the.airborne.system.transmits.only.in.

response.to.received.uplink.messages.(polls)

(.1.).Active.Clearance.Control. ACC

(.2.).Area.Control.Center

Accelerometer Acclrm

Aviation.Coordinating.Committee.for. ACCTS

Telecommunications.Services

(.1.).The.control.character.meaning.technical. ACE

acknowledge.

(.2.).Actuator.Control.Electronics. ( 3 ) Advanced Certification Equipment

(.1.).Area.Control.Facility.. ACF

(.2.).ACARS.Convergence.Function.(ARINC.622)

Aircraft Identification ACID

Airfoil.and.Cowl.Ice.Protection.System ACIPS

The.control.character.meaning.technical. ACK

acknowledgement.of.an.uplink,.used.in.an.

ACARS.System

Acknowledge ACKNLGE

Alternating.Current.Motor.Pump ACMP

Aircraft.Condition.Monitoring.System ACMS

Aircraft Certification Office ACO

Audio.Control.Panel ACP

Aircraft Certification Regulatory Program ACRP

(.1.).Active.Control.System. ACS

(.2.).Audio.Control.System

Aeronautical.Communications.Sub-Group ACSG

3

Active ACT

(.1.).Apron.Control.Unit.. ACU

(.2.).Antenna.Control.Unit..

(.3.).Autopilot.Control.Unit

Analog-To-Digital A/D

Administrative.Domain AD

Computer.Programming.Language ADA

Automated Weather Observing System Data ADAS

Acquisition System

Advanced.Design.Adaptive.Test.Executive ADATE

(.1.).Air.Data.Computer:.A.computer.that.receives. ADC

inputs.from.temperature.sensors.as.well.as.

static.and.pitot.ports..Then.it.generates.altitude,.

airspeed,.vertical.speed.and.several.computed.

temperatures...

(.2.).Analog-to-Digital.Converter

Automatic.Direction.Finder:.Receiver.that. ADF

provides bearings to radio frequency transmitters

in a compatible frequency range.

Attitude.Director.Indicator:.A.PFD.display.that. ADI

provides.pitch.and.roll.information.

Air.Data.Inertial.Reference.System ADIRS

Air.Data.Inertial.Reference.Unit ADIRU

(.1.).Aeronautical.Data.Link.. ADL

(.2.).Airborne.Data.Loader.(ARINC.615)

(.1.).Airborne.Data.Link.Protocol. ADLP ( 2 ) Aircraft Data Link Processor (MODE-S)

Aeronautical.Data.Link.Services ADLS

Air.Data.Module ADM

Airline.Data.Management.System ADMS

ARINC.Data.Network.Service ADNS

Air.Data.Processor ADP

Adaptive.Pulse.Code.Modulation ADPCM

Airplane.Data.Recovery.and.Analysis.System ADRAS

4

(.1.).Air.Data.System.. ADS

(.2.).Automatic.Dependent.Surveillance:.

A surveillance technique in which aircraft

automatically.provide,.via.data.link,.data.derived.

from on-board navigation and position fixing

systems, including aircraft identification, four

dimensional.position.and.additional.data.as.

appropriate..

(.3.).Audio.Distribution.System

Automatic.Dependent.Surveillance–Address.. ADS-A

(aka.ADS-C)

Automatic.Dependent.Surveillance–Broadcast ADS-B

Automatic.Dependent.Surveillance–Contract.. ADS-C

(aka.ADS-A)

Address.Selective..ASSR.system.electronically. ADSEL

arranged.to.address.each.transponder.selectively..

Only a particular transponder will respond, thus

avoiding.garbling..ADSEL.uses.a.monopulse.

technique to provide more accurate bearing

measurement..ADSEL.is.compatible.with.DABS..

(Refer.to.Mode.S.transponders.)

Automatic.Dependent.Surveillance.Panel ADSP

(.1.).Automatic.Dependent.Surveillance.System.. ADSU

(.2.).Automatic.Dependent.Surveillance.Unit

Administrative.Data.Transmission.Network ADTN

Advance ADV

Audio.Electronic.Control.Unit AECU

Airlines.Electronic.Engineering.Committee AEEC

Aircraft.Evaluation.Group AEG

(.1.).Audio.Entertainment.Player. AEP

(.2.).Autopilot.Engage.Panel

Automated En Route traffic control AERA

Aircraft.Earth.Station AES

Auxiliary Equipment Unit AEU

Airway.Facilities AF

_

( 1 ) Automatic Frequency Compensation. AFC

( 2 ) Automatic Frequency Control

Automatic.Flight.Control.Augmentation.System AFCAS

Automatic.Flight.Control.System AFCS

(.1.).Adaptive.Flight.Display.. AFD

(.2.).Advanced.Flight.Deck..

(.3.).Autopilot.Flight.Director

Autopilot.Flight.Director.Computer AFDC

Autopilot.Flight.Director.System AFDS

Avionics.Full.Duplex.Switched.Ethernet AFDX

ACARS.Front.End.Processing.System AFEPS

Authority Format Identifier AFI

(.1.).Airborne.Flight.Information.System. AFIS

(.2.).Automatic.Flight.Information.Service

Aircraft.Flight.Manual AFM

ATS Facilities Notification AFN

(.1.).Aeronautical.Fixed.Service. AFS

(.2.).Airborne.File.Server..

(.3.).Automatic.Flight.System

Automatic.Flight.Service.Station AFSS

Audio Frequency Shift Keying AFSK

Aeronautical.Fixed.Telecommunications AFTN

Aerospace.and.Flight.Text.Radio.Coordinating. AFTRCC

Council

Air/Ground A/G

Automatic.Ground-Air.Communication.System..It. AGACS

is.also.known.as.ATCSS.or.DATA.LINK.

Advanced.General.Aviation.Transport.Experiment AGATE

Automatic.Gain.Control..AGC.is.used.to.maintain. AGC

the.output.level.of.the.receiver.

Air.Ground.Intermediate.System AGIS

Above.Ground.Level. AGL

ARINC.661.Graphics.Server AGS

6

Alert.Height:.A.height.above.the.runway.based. AH

on.the.characteristics.of.the.aircraft.and.its.fail.

operational.landing.system,.above.which.a.

Category.III.approach.would.be.discontinued.and.

a.missed.approach.initiated.if.a.failure.occurred.in.

one.of.the.redundant.parts.of.the.fail.operational.

landing.system,.or.in.the.relevant.ground.

equipment.

Attitude.Heading.Computer:.A.computer.that.is. AHC

part.of.the.AHRS..Generates.information.for.the.

pitch.and.roll.displays.

Attitude/Heading.Reference.Systems:.System. AHRS

which.measures.and.outputs.aircraft.attitude.and.

heading.

Attitude/Heading.System:.Either.an.AHRS.or.an. AHS

IRS.

Aircraft.Integrated.Data.System AIDS

Advanced.Intelligence.Tape.-.used.for.the.storage. AIT

of digital video and audio files

Aeronautical.Information.Regulation.and.Control AIRAC

Accumulator.Isolation.Valve AIV

Advanced.Interactive.Executive AIX

AFEPS.Journal.Processing.System AJPS

Autoland A/L

Automatic.Level.Control..A.circuit.used.to. ALC

maintain.the.output.of.a.transmitter.regardless.of.

variations.in.the.attenuation.of.the.system.

Automatic.Link.Establishment ALE

Altimeter ALI

Airline.Pilots.Association ALPA

(.1.).Application.Layer.Structure. ALS

(.2.).Ambient.Light.Sensor

Clear ALSIP

_

(.1.).Airborne.Link.Terminal.. ALT

(.2.).Alternate..

(.3.).Altimeter..

(.4.).Altitude

Alternate.Attitude.Heading.Computer ALT AHC

Altitude.Hold.Mode ALTHOLD

Height.determined.by.barometric.pressure Altitude

A.continuous.return.across.the.display.at.a.range. Altitude Ring

equivalent to aircraft altitude (WXR)

Alternate ALTN

Altitude.Select ALTS

Selected Altitude Capture: An autopilot flight ALTS CAP

director.mode.

Arithmetic.and.Logic.Unit ALU

Amplitude.Modulation..A.signal.where.the.carrier. AM

signal.is.varied.in.amplitude.to.encode.voice.or.

data.information.

Airport.Movement.Area.Safety.System AMASS

Aircraft.Mount.Alignment.Detector AMAT

Avionics.Maintenance.Conference AMC

Aeronautical.Mobile.Communications.Panel AMCP

Amplitude Modulation Equivalent. An AM type AME

signal.that.processes.the.modulated.information.

signal and carrier frequency separately and

then.reconstructs.the.two.signals.to.make.an.

equivalent AM signal.

( 1 ) Airline Modifiable Information . AMI

(.2.).Alpha.Margin.Indicator:.A.device.that.displays.

the.angle.of.attack.

Area.Microphone.Interface.Unit AMIU

Active Matrix Liquid Crystal Display AMLCD

Aircraft.Maintenance.Manual AMM

(.1.).Audio.Management.Panel.. AMP

(.2.).Avionics.Modernization.Program

_

(.1.).Apron.Management.Service.. AMS

(.2.).Avionics.Management.Service

Aeronautical.Mobile.Satellite.(Route).Service AMS(R)S

Aeronautical.Mobile.Satellite.Service AMSS

Aircraft Maintenance Task Oriented Support AMTOSS

System..An.automated.data.retrieval.system.

Aeronautical.Message.Transfer.Service AMTS

Audio.Management.Unit AMU

Audio.Multiplexer AMUX

Air Navigation Commission (ICAO) ANC

An.evacuated.and.sealed.capsule.or.bellows.that. Aneroid

expands.or.contracts.in.response.to.changes.in. Capsule

pressure.

Alaskan.NAS.Interfacility.Communication.System ANICS

ARINC.Network.Layer.Protocol ANLP

Actual.Navigation.Performance:.Measure.of. ANP

the.current.estimated.navigation.performance,.

excluding.Flight.Technical.Error.(FTE).

(.1.).Ambient.Noise.Sensor.. ANS

(.2.).Area.Navigation.System

American.National.Standards.Institute ANSI

Air.Navigation.Service.Provider ANSP

Antenna ANT

Advanced.Networking.Test.Center ANTC

Angle Of Attack AOA

( 1 ) Aeronautical Operational Control. AOC

( 2 ) Aircraft Operational Control.

( 3 ) Airline Operational Control.

( 4 ) Airport Obstruction Chart .

( 5 ) Airport Operational Communications

Airline Operation Control Center AOCC

Audio.on.Demand AOD

Age.of.Data,.Clock.(GPS.term) AODC

Age.of.Data,.Ephemeris.(GPS.term) AODE

9

Aircraft.on.Ground AOG

Air/Oil Heat Exchanger AOHE

Aircraft Operating Manual AOM

( 1 ) Aeronautical OSI Profile . AOP

( 2 ) Airline Operational Procedure

Aircraft Owners and Pilots Association AOPA

Aerodrome Operations Group AOPG

Atlantic Ocean Region AOR

Atlantic Ocean Region-East AOR-E

Atlantic Ocean Region-West AOR-W

Autopilot..A.computer.commanded.system.for. A/P

controlling.aircraft.control.surfaces.

Airport.Location.(ACARS/AFERS) AP

(.1.).Allied.Pilots.Association.. APA

( 2 ) Autopilot Amplifier

Auxiliary.Power.Breaker APB

(.1.).Autopilot.Computer.. APC

(.2.).Aeronautical.Public.Correspondence..

(.3.).Aeronautical.Passenger.Communication

Application.Programming.Interface API

Aircraft.Personality.Module APM

Automated.Performance.Measurement.System APMS

ARINC.Packet.Network APN

(.1.).Approach.Control.. APP

(.2.).Autopilot.Panel

Application App

Approach: That segment of flight having to do APPR with final descent and landing.

Actual.Performance.Reserve APR

ATN Profile Requirement List APRL

Autopilot.System APS

Auxiliary.Power.Unit APU

Auxiliary.Power.Unit.Controller APUC

_0

Avionics Qualification Facility AQF

( 1 ) Advanced Qualification Program. AQP

( 2 ) Avionics Qualification Procedure

Aeronautical.Quadrature.Phase.Shift.Keying A-QPSK

Advanced.Quality.System AQS

Aviation.Rule.making.Advisory.Committee ARAC

Arbitrary.Waveform.Generator ARB

Airline.Risk.Factor ARF

Aeronautical.Radio,.INCorporated:.Corporation.in. ARINC

which.the.U.S..scheduled.airlines.are.the.major.

stockholders.

-XXX Digital database protocols defined by ARINC

ARINC.committee.

Area.Regional.Maintenance.Center ARMC

(.1.).Aeronautical.Recommended.Practice... ARP

(.2.).Air.Data.Reference.Panel..

(.3.).Airport.Reference.Point:.Point.in.space.

based.on.a.particular.altitude,.waypoint.and/or.

offset..The.FMS.makes.calculations.to.guide.the.

aircraft.to.that.particular.point.

Advanced.Research.Projects.Agency ARPA

Airport ARPT

Arrival ARR

Automated.Radar.Summary.chart...These.are. ARS

hourly.generated.charts.showing.location.and.

intensity.of.radar.echoes.

Air.Route.Surveillance.Radar ARSR

Automatic.Reserve.Thrust ART

Adaptive Radar Threshold Techniques ARTT

Air-Route Traffic Control Center. Approximately ARTCC

20 centers cover the air traffic routes in the

United.States.using.numerous.radars.and.radio.

communication.sets.

Automated.Terminal.Radar.System ARTS

Audio.Reproducer.Unit ARU

__

(.1.).Aircraft.Separation.Assurance. ASA

(.2.).Autoland.Status.Annunciator.(AFDS)

AC.RS.System.Access.Approval.(AEEC) ASAA

Aviation.Safety/Accident.Prevention ASAP

Aircraft.Separation.Assurance.System.(AEEC) ASAS

American.Standard.Code.for.Information. ASCII

Interchange

Air.Supply.and.Cabin.Pressure.Controllers ASCPC

Aircraft.Situation.Display ASD

Airport Surface Detection Equipment ASDE

Aeronautical.Satellite.Data.Link ASDL

Altimetry.System.Error ASE

Agency.for.the.Security.of.Aerial.Navigation.in. ASECNA

Africa.and.Madagascar

Altitude Select: An autopilot flight/director mode. ASEL

ARINC.Signal.Gateway ASG

(.1.).Avionics.System.Integration.. ASI

(.2.).Airplane.Systems.Integrator

Application Specific Integrated Circuit ASIC

Avionics.System.LAN.Switch ASLS

(.1.).Airspace.Management.. ASM

(.2.).Autothrottle.Servo.Motor.. ( 3 ) Avionics Specific Module .

( 4 ) Application Specific Module

Abstract Syntax Notation One ASN._

Automated Surface Observing System ASOS

(.1.).Altitude.Set.Panel.. ASP

(.2.).Aeronautical.Fixed.Service.(AFS).Systems.

Planning.for.data.interchange

Aeronautical.Fixed.Service.(AFS).Systems. ASPP

Planning.for.data.interchange.Panel

Advanced.Surface.Movement.Guidance.and. A-SMGCS

Control.Systems

Airport.Surveillance.Radar ASR

__

Aviation.Safety.Reporting.System ASRS

Airborne.Surveillance.and.Separation.Assurance. ASSAP

Processing

Aerospace.Simulation.and.Systems.Test.Center ASSTC

Airspace.System.Task.Force ASTF

(.1.).Avionics.Switching.Unit.. ASU

( 2 ) Application Specific Unit

Advanced.Super.View ASV

Alternate.Source.Selection.Valve ASSV

Airport Surface Traffic Automation ASTA

( 1 ) Air Traffic . AT

(.2.).Air.Transport

Auto.throttle A/T

(.1.).Actual.Time.of.Arrival. ATA

(.2.).Air.Transport.Association

Air Traffic Control ATC

Air Traffic Control Association ATCA

Air Traffic Control Center ATCC

Air Traffic Control Radar Beacon System ATCRBS

Air Traffic Control Signaling System .A system ATCSS

to.provide.information.between.the.pilot.and.air.

traffic control using the VHF communications

transceiver.in.conjunction.with.data.link.

equipment.

Actual.Time.of.Departure ATD

Automatic Test Equipment ATE

Air Traffic Flow Management ATFM

Autothrust.System ATHR

Automatic.Target.Handoff.System ATHS

Instrument.Size.Unit.of.Measure ATI

( 1 ) Air Traffic Information Service. ATIS

(.2.).Automatic.Terminal.Information.Service.

(.3.).Automatic.Terminal.Information.System

Abbreviated.Test.Language.for.Avionics.Systems ATLAS

_3

( 1 ) Air Traffic Management . ATM

(.2.).Asynchronous.Transfer.Mode.

Air Traffic Management Concept Panel (ICAO) ATMCP

Aeronautical.Telecommunications.Network ATN

Aeronautical.Telecommunication.Network.Panel ATN P

Acceptance.Test.Procedure.(Air.Transport) ATP

Air.Transport.Racking ATR

( 1 ) Air Traffic Services . ATS

(.2.).Air.Turbine.Starter..

(.3.).Auto.throttle.System..

(.4.).Air.Transport.System

Air Traffic Service Communication ATSC

Air Traffic Services Geographic Filter ATSGF

Air Traffic Services Message Processor ATSM

Air Traffic Services Unit ATSU

Attitude ATT

Airspace User Operations AUO

Automatic AUTO

Mechanism.that.automatically.tilts.the.weather. AUTOTILT

radar.

Auxiliary AUX

Audio-Visual AV

Available AVAIL

Aviation.Electronics:.Any.group.of.aircraft. AVIONICS

electronic.devices.

Avionics.Local.Area.Network AVLAN

Aviation.VHF.Link.Control AVLC

Airborne.Vibration.Monitor AVM

Aerodrome Visibility Operational Level AVOL

Aviation.Packet.Communication AVPAC

Airborne.Warning.and.Control.System AWACS

Automated.Weather.Advisory.Station AWAS

American.Wire.Gauge AWG

_4

Aviation.Weather.Information AWIN

Advanced.Weather.Interactive.Processing. AWIPS

System

Audio.Warning.Mixer AWM

All Weather Operations AWO

All Weather Operations Panel AWOP

Automated Weather Observation System. A AWOS

system.that.gathers.surface.weather.information. and transmits the information to the pilot via VOR,

Comm Freq or telephone lines.

Azimuth:.Distance.in.degrees.measured. AZ

clockwise.from.North.

At or Below (Altitude suffix) B

An.approach.from.the.end.of.the.runway.opposite. BACKCOURSE

the.front.localizer..Normally.in.this.type.of.

approach,.there.is.no.glideslope.available.

The.difference.between.the.highest.and.lowest. Bandwidth

frequency components of a signal.

Basic.Area.Navigation B-RNAV

Bank.Angle.Protection BAP

Barometric BARO

Pressure.altitude-corrected.local.barometric. Baron-

pressure. Corrected

Altitude

Type.B.Application.to.Application.Protocol BATAP

Back.Azimuth:.Same.concept.as.Backcourse. BAZ

except,.the.pilot.uses.the.Microwave.Landing.

System.(MLS)..An.MLS.BAZ.transmitter.on.the. ground is required.

Base.Band BB

Backcourse B/C

Binary.Coded.Decimal..A.coding.system.in.which. BCD

each.digit.from.0.to.9.is.represented.by.a.four.bit.

binary.number.

Back.Course BCRS

__

Block Check Sequence. BCS is a cyclic code that BCS

is.used.as.reference.bits.in.an.error.detection.

process.

b@ckCHANNEL.SERVER bCSU

Bearing.Distance.Indicator BDI

Business.Data.Management.and.Invoicing BDMIS

The.beam.width.is.the.width.of.the.beam.as. Beam Width

measured.at.the.half-power.points.of.the.radiated.

signal.(WXR).

The.direction.of.a.point.or.navigational.aid. Bearing

measured.clockwise.from.a.reference.through.

360°.

Boeing.Electronic.Delivery.System BEDS

Below BEL

Back-End.Processor BEP

Back-End.Processor.Management.System BEPMS

Bite.Error.Rate BER

Buyer Furnished Equipment BFE

Beat Frequency Oscillator. An oscillator that BFO

produces.a.signal.to.be.mixed.with.the.received. frequency to produce an audible beat note, for

the purpose of decoding the Morse code identifier

of an NDB. The oscillator produces frequencies

equal to the sum and difference of the combined

frequencies.

Broadband.Global.Area.Network BGAN

Bus.Grant.Inhibit..A.term.used.in.CAPS.transfer. BGI

bus.processing.

Border.Gateway.Protocol BGP

Burn-In BI

Bilingual.Ground.Station.(ACARS.and.VDML2) BiGS

Base-2.counting.system..Numbers.include.0,1. Binary

Boundary.Intermediate.System BIS

BIS.Management.System BISMS

_6

Built-In.Self.Test BIST

A.binary.digit..Smallest.data.unit.in.a. Bit

microprocessor.system.

Built-In-Test BIT

Built-In-Test Equipment BITE

Black.Label BL

(.1.).Black.. BLK

(.2.).Block

Bezel.Light.Sensor BLS

Brake.Metering.Valve BMV

Binary BNR

Boundary Notification System (Squitters) BNS

Bottom.of.Climb BOC

Bill.of.Material BOM

Bit Oriented Protocol BOP

The.process.of.aligning.a.directional.antenna. Boresighting

system.

(.1.).BITE.Processor.. BP

(.2.).Bottom.Plug

Bus.Power.Control.Unit BPCU

bites.per.second bps

Bytes.per.second Bps

Binary.Phase.Shift.Keying BPSK

Bridge BR

Bearing BRG

Basic.Rate.Interface BRI

Basic.Area.Navigation BRNAV

Business.&.Regional.Systems BRS

Brightness BRT

Brake.System.Control.Unit BSCU

Backbone.Subnetwork BSN

Board.Support.Package BSP

__

(.1.).Beam.Steering.Unit.. BSU

(.2.).Bypass.Switch.Unit

Bus.Tie.Breaker BTB

Brake.Temperature.Monitor.Unit BTMU

British.Thermal.Units BTU

Backup.WAN BWAN

A.grouping.of.eight.bits. Byte

Celsius. C

Command.and.Control C&C

Control.and.Warning C&W

Civil.Aviation.Authority..A.regulatory.agency.in.the. CAA

United.Kingdom.

Civil.Aviation.Administration.of.China CAAC

Caution.Advisory.Computer CAC

( 1 ) Course Acquisition Code . C/A Code

( 2 ) GPS Course Acquisition Code

Cabin.Area.Control.Panel CACP

(.1.).Computer.Aided.Design. CAD

(.2.).Combiner.Alignment.Detector

Communications.Automation.and.Data.Link CADAG

Component.Application.Engineer CAE

Crew.Alerting.Function CAF

Commercial.Avionics.GPS.Engine CAGE

Cabin.Attendant.Handsets CAH

Caution.Annunciator.Indicator CAI

Corrected.for.instrument.errors.and.errors.due. Calibrated

to.position.or.location.of.the.pressure.source..At. Airspeed

standard sea level conditions, CAS is equal to

true.airspeed.(TAS).

A.variation.of.the.SELCAL.system.in.which.the. CALSEL

SELCAL.signal.is.combined.with.a.special.gating.

toe.to.produce.an.automatic.function.by.the.

receiver..This.system.is.only.a.proposal.and.not.

yet.implemented.

__

Calibration Verification CALVER

(.1.).Computer.Aided.. CAM

(.2.).Cockpit.Area.microphone..

(.3.).Manufacturing

Constant.Angle.Non-Precision.Approach CANPA

Captain CAPT

Chinese.Aeronautical.Radio.Electronics.Research. CARERI

Institute

An.ac.signal.that.can.be.modulated.by.changing. Carrier

the amplitude, frequency or pulse of the signal.

(.1.).Collision.Avoidance.System.. CAS

(.2.).Computed.Airspeed..

(.3.).Crew.Alerting.System..

(.4.).Collins.Aviation.Services

Computer.Aided.Software.Engineering CASE

(.1.).Categories.(I,.II,.III).for.Visibility. CAT

Requirements .

(.2.).Clear.Air.Turbulence..

(.3.).Computer.Aided.Testing

Operational performance Category I. An ILS CAT I

facility.providing.operation.down.to.a.60-meter.

(200.feet).decision.height.and.with.runway.visual.

range.not.less.than.800.meters.(2600.feet).and.a.

high.probability.of.approach.success.

An.ILS.Approach.to.lower-than-standard.Category. CAT I Enhanced

I.and.in.some.cases.to.Category.II,.minimums,.

based.on.guidance-to-touchdown.provided.by.a.

Category.III-capable.Head-up.Guidance.System,.

per FAA Order 8400.13.

Operational performance Category II. An ILS CAT II

facility.providing.operation.down.to.a.30-meter.

(100.feet).decision.height.and.with.runway.visual.

range.not.less.than.400.meters.(1200.feet).and.a.

high.probability.of.approach.success.

_9

Operational performance Category III a. An ILS CAT III a

facility.providing.operation.with.no.decision.height.

limit.to.and.along.the.surface.of.the.runway.with.

external visual reference during final phase of

landing.and.with.a.runway.visual.range.of.not.less.

than.200.meters.(700.feet).

Operational performance Category III b. An ILS CAT III b

facility.providing.operation.with.no.decision.height.

limit.to.and.along.the.surface.of.the.runway.

without.reliance.on.external.visual.reference;.and. subsequently taxiing with external visual range of

not.less.than.50.meters.(150.feet).

Operational performance Category III c. An ILS CAT III c

facility.providing.operation.with.no.decision.height.

limit.to.and.along.the.surface.of.the.runway.and.

taxiways.without.reliance.on.external.visual.

reference.

Clear.Air.Turbulence.Enhanced.Vision.System CATEVS

The frequency range between 4,000 and 8,000 C-BAND

MHz.

Continuous.Built-In-Test CBIT

Computer-Based.Training CBT

C-Check CC

Circuit.Card.Assembly CCA

( 1 ) Configuration Control Board . CCB

(.2.).Converter.Circuit.Breaker

(.1.).Charged.Coupled.Device. CCD

(.2.).Cursor.Control.Device

International.Radio.Consultative.Committee CCIR

Consultative.Committee.International.Telephone. CCITT

and.Telegraph

Common.Computing.Module CCM

Content.Compilation.Management.System. CCMS

Common.Computing.Resource CCR

_0

(.1.).Cabin.Communication.System.. CCS

(.2.).Common.Communication.System..

(.3.).Common.Core.System

Control.and.Compensation.Unit CCU

Counterclockwise CCW

(.1.).Carrier.Detect.. CD

(.2.).Chrominance.Difference.

(.3.).Compact.Disc

(.1.).Coordinating.Design.Authority. CDA

(.2.).Continuous.Descent.Arrival

Cabin.Data.Bus.Repeater CDBR

Configuration Database Generator CDG

Course.Deviation.Indicator CDI

Cabin.Discrepancy.Log CDL

Collaborative.Decision.Making CDM

Code.Division.Multiple.Access CDMA

Collaborative.Decision.Making.System CDMS

(.1.).Canadian.Domestic.Network.(VHF.ACARS).. CDN

(.2.).Common.Data.Network

Continuous.Data.Program CDP

Critical.Design.Review CDR

Compact Disc Read-Only Memory CD-ROM

(.1.).Cabin.Distribution.System. CDS

(.2.).Common.Display.System

Cockpit Display of Traffic Information CDTI

Control.Display.Unit:.An.input.control/display. CDU

usually.part.of.a.Flight.Management.System.

(FMS).

Conference.Europèene.des.Postes.et. CEPT

Telècommunications

Cabin Equipment Software CES

Checklist.Entry.Unit CEU

Change.Field CF

Central.Fault.Display.Interface.Unit CFDIU

__

Centralized.Fault.Display.System CFDS

Controlled.Flight.Into.Terrain CFIT

Cubic.Feet.per.Minute cfm

Central.Flow.Management.Unit CFMU

Cabin.File.Server CFS

Center.of.Gravity CG

Connecting.Gate.Information CGI

Channel CHAN

(.1.).Change.. CHG

(.2.).Charge

Computer.Human.Interface CHI

Center.Hydraulic.Isolation.System CHIS

Collins High Order Language CHOL

Course.Heading.Panel CHP

(.1.).Cabin.Interphone.. CI ( 2 ) Configuration Item

Category.Interaction.Diagram CID

Checklist.Input.DataBase CIDB

Common ICAO Data Interchange Network CIDIN

Cabin.Interphone.Distribution.System CIDS

Commission.Internationale.de.I.Eclairage CIE

Common Input/Output CIO

(.1.).Corporate.Information.System.. CIS

(.2.).Crew.Information.System

Configurable Integrated Surveillance System CISS

Check CK

Checklist CKLST

(.1.).Climb.. CLB

(.2.).Closed-Loop.Boolean

Clock CLK

Connectionless.Network.Protocol CLNP

Connectionless.Network.Service CLNS

__

Water.or.ice.particles.having.radii.smaller.than. Cloud Droplets

0.01.cm

Control.Law.Processor CLP

Clear CLR

Connectionless.Mode.Transport.Protocol CLTP

(.1.).Context.Management.. CM

( 2 ) Configuration Management.

( 3 ) Conflict Management

(.1.).Central.Maintenance.Application.. CMA

(.2.).Contract.Maintenance.Agreement

Central.Maintenance.Computer CMC

Central.Maintenance.Computer.Function CMCF

Central.Maintenance.Computer.System CMCS

Command CMD

(.1.).Common.Message.Format.. CMF

(.2.).Communication.Management.Function

(.1.).Common.Mode.Monitor..A.type.of.monitor. CMM

common to automatic flight control systems. .

(.2.).Component.Maintenance.Manuals.

Control.Motion.Noise CMN

Configuration Management Plan CMP

Cabin.Management.System CMS

Complementary Metal Oxide Semiconductor CMOS

Commercial.Mobile.Radio.Service.. CMRS

(cellular.phone.network)

Communications.Management.Unit CMU

Customized.Navigation.Database CNDB

Centre.national.d’etudes.spatiales CNES

Carrier-to-Noise.Density.Ratio C/NO

Comm/Nav/Pulse CNP

Communication,.Navigation,.Surveillance CNS

Communication,.Navigation,.Surveillance/Air. CNS/ATM

Traffic Management

_3

A.track.that.is.continued.based.on.previous.track. Coasted Track

characteristics.in.the.absence.of.surveillance.data.

reports.(TCAS).

Coder/Decoder CODEC

Combiner Optical Element COE

Cockpit Operating Manual COM

Communications /Meteorological /Operations COM/MET/OPS

Communications COMM

Communication Of Modification Plan COMP

A.low-powered.radio.beacon,.used.in.conjunction. Compass

with.ILS..A.compass.locator.has.a.two-letter. Locator

identification and a range of at least 15 miles.

Compressor COMP

Continuous CON

An.inverted.conical.shaped.area.extending. Cone of

vertically above a VOR ground facility that is void Confusion

of.the.bearing.signal.

Concept of Operations CONOPS

A low-frequency, keyed, CW, short baseline Consolan

system.using.two.antennas.to.radiate.a.daisy-

shaped.pattern.for.navigational.aid.purposes..The. frequency range is in the 300 kHz region . It is in

limited.use.today.

Contouroriso.–.contour.refers.to.a.weather.radar. Contour

display.presentation.that.blanks.the.echo.returns.

in.the.center.of.a.storm.cell..The.area.blanked.out.

is.called.contour.and.corresponds.to.the.return.

levels.that.exceed.a.predetermined.threshold.

Continental.United.States CONUS

Character-Oriented Protocol COP

Communities.of.Practice COPs

Common.Reusable.Elements CoRE

Company.Route COROUTE

_4

A.correction.is.applied.to.static.source.pressure. Correction

measurements.to.partly.or.completely.correct. (SSEC)

for pressure errors that are caused by airflow

changes..It.is.computed.as.a.function.of.Mach.

and.altitude.based.on.measured.errors.for.a.

particular.static.system.

A.resolution.advisory.that.instructs.the.pilot.to. Corrective

deviate from current vertical rate (e. g. DON’T Advisory

CLIMB.when.the.aircraft.is.climbing)..(TCAS)

Checklist Operational Software COS

Connection Oriented Transport Protocol COTP

Commercial Off-The-Shelf COTS

(.1.).Circular.Polarization.. CP

( 2 ) Conflict Probe .

(.3.).Control.Panel

Closest.Point.of.Approach CPA

Collins.Portable.Access.System CPAS

(.1.).Cabin.Pressure.Controller.. CPC

(.2.).Controller.Pilot.Communication..

(.3.).Cursor.Position.Control

Compact.Peripheral.Component.Interconnect cPCI

Computer Program Configuration Item. A CPCI CPCI

number identifies the configuration of a computer

software.program.

Cabin.Pressure.Control.System CPCS

Controller-Pilot.Data.Link.Communications CPDLC

Circular.Position.Error CPE

(.1.).Core.Processor.Module.. CPM

(.2.).Crash.Protected.Memory

Collins.Part.Number CPN

Common.Processing.Resource CPR

Compressor CPRSR

Cabin.Pressure.Sensor CPS

Contractor.Purchasing.System.Review CPSR

Central.Processing.Unit CPU

__

Command/Response C/R

( 1 ) Change Request . CR

(.2.).Contrast.Ratio

(.1.).Cyclic.Redundancy.Checking.. CRC

(.2.).Cyclic.Redundancy.Code

Corrosion.Resistant.Steel CRES

Current.Routing.Domain CRD

Cooperative.Research.and.Development. CRDA

Agreement

(.1.).Cockpit.Resource.Management.. CRM

(.2.).Collision.Risk.Model..

(.3.).Crew.Resource.Management

Controlled.Reception.Pattern.Antenna CRPA

Cutover.Readiness.Review CRR

Course CRS

Cathode.Ray.Tube CRT

Computer.Receiver.Unit CRU

Cruise CRZ

(.1.).Common.Service.. CS

(.2.).Collins.Commercial.Systems.Engineering

Cargo.System.Controller CSC

Computer Software Configuration Item CSCI

Cabin.System.Control.Panel CSCP

Commercial.Standard.Data.Bus CSDB

Cargo.Smoke.Detector.System CSDS

Control.Systems.Electronics.Unit CSEU

Command/Status.Frame CSF

Carrier.Sense.Multiple.Access CSMA

Carrier.Sense.Multiple.Access.with.Collision CSMA/CD

Crash.Survivable.Memory.Modules CSMM

Cabin.System.Management.Unit CSMU

Communications/Surveillance Operational C/SOIT

Implementation.Team

_6

Configuration Strapping Unit: A LRU used to CSU

select.installed.system.features.on.a.particular.

aircraft.

Chromaticity.Tolerance CT

( 1 ) Control Area (ICAO Term) . CTA

(.2.).Controlled.Time.of.Arrival

Common Traffic Advisory Frequency CTAF

Cowl.Thermal.Anti-Icing CTAI

Center.Tracon.Automation.System CTAS

Cabin.Temperature.Controller CTC

Cross.Track.Deviation CTD

Control: Refers to a radio frequency controller CTL

Centralized Air Traffic Flow Management CTMO

Organization

Conventional Take Off and Landing CTOL

(.1.).Center.. CTR

(.2.).Control.zone

Configuration Test Requirements Document CTRD

Control CTRL

Clear.To.Send CTS

Cabin.Telecommunications.Unit CTU

(.1.).Channel.Utilization.. CU

(.2.).Combiner.Unit.(HUD)..

(.3.).Control.Unit

Code/Unit.Test C/UT

Cockpit.Voice.and.Digital.Flight.Data.Recorder CV/DFDR

Cockpit.Voice.Recorder CVR

Cockpit.Voice.Recorder.Control.Panel CVRCP

(.1.).Clockwise.(cw).. CW

(.2.).Continuous.Wave..A.continuous.train.of.

identical.oscillations.

Comparator.Warning.Computer CWC

Continuous.Wave.Interference CWI

__

Comparator.Warning.Monitor CWM

(.1.).Controlled.Working.Position. CWP

(.2.).Controller.Working.Position

Control.Wheel.Steering CWS

Differential.Eight.Phase.Shift.Keying D_PSK

Description and Operation D&O

(.1.).Descent.Advisor.. DA

(.2.).Drift.Angle

Digital-to-Analog D/A

Discrete.Addressable.Beacon.System DABS

Digital.Air.Data.Computer DADC

Digital.Air.Data.System DADS

Digital.Service.Access.Product DAP

Downlink.of.Aircraft.Parameters DAPs

Designated.Airworthiness.Representative-A. DAR

designation.of.authority.by.the.FAA,.authorized.

under.FAR.Part.183,.Subpart.C.

Dynamic.Aircraft.Route.Planning DARP

Direct.Access.Radar.Channel..An.independent. DARC

backup.to.main.ATC.computers.

Defense.Advanced.Research.Projects.Agency DARPA

Dynamic.Aircraft.Route.Planning.Study DARPS

Designated.Alteration.Station:.A.designation.of. DAS

Authority.authorized.by.the.FAA.under.FAR.Part.

21,.Subpart.M.

A.system.that.allows.exchange.of.digital.data.over. Data Link

an.RF.link..ATCSS.is.a.data.link.system.used.by.

the air traffic control system. ACARS is a data

link.system.used.by.airline.command,.control.and.

management.system.,.using.VHF.communication.

frequencies.

Digital.Automatic.Terminal.Information.System D-ATIS

( 1 ) Data Acquisition Unit . DAU

(.2.).DBS.Antenna.Unit

__

Database DB

Decibel dB

Decibels.Adjusted dBA

(.1.).Decibels.above.isotopic.circular. DBi

(.2.).Decibels.referenced.to.an.isotopic.antenna

Downlink Block Identifier DBI

Decibel(s).below.1.milliwatt dBm

Database.Management.System DBMX

Direct.Broadcast.Satellite DBS

Decibels.referenced.to.1.watt DBw

Decibel-Watts dBW

Database.Unit DBU

Direct.Current DC

Display.and.Crew.Alerting.system DCA

Digital.Control.Audio.System DCAS

Demand.and.Capacity.Balancing DCB

Double.Channel.Duplex..A.communication. DCD

system.using.two.RF.channels,.one.channel.for.

receive.and.one.channel.for.transmit.operations,.

for.simultaneous.communication.

Data Communications Equipment DCE

Data.Conversion.Gateway.Function DCGF

Departure.CLearance DCL

Data.Communication.Management.Function DCMF

Data.Communication.Management.System DCMS

(.1.).Design.Change.Notice.. DCN

(.2.).Document.Change.Notice..

(.3.).Drawing.Change.Notice

Display.Control.Panel:.Used.to.operate.modes.of. DCP

EFIS.system.

_9

Double.Channel.Simplex..A.communication. DCS

system.using.two.RF.channels.for.non-

simultaneous communication. One channel

is.disabled.while.the.other.channel.is.used.to.

transmit.

Data.Concentrator.Unit DCU

Directional.Control.Valve DCV

(.1.).Data.Delivery.. DD

(.2.).Data.Dictionary

(.1.).Digital.Differential.Analyzer.. DDA

(.2.).Distance.Data.Adapter

Dual.Disk.Drive DDD

Direct.Dial.Indicator DDI

Decoder.Digital.Interface.Box DDIB

Difference.in.Depth.of.Modulation,.a. DDM

measurement.used.in.conjunction.with.ILS.

signals.

Declarations.of.Design.and.Performance..A. DDP

control document required by the United Kingdom

Civil Aviation Authority (CAA) for certification of

avionics equipment.

Draft.Document.Review DDR

Direct.Digital.Synthesizer DDS

Downlink.Data.Transfer DDT

Data.Link.Delivery.of.Expected.Taxi.Clearances DDTC

Display.Drive.Unit DDU

Design.Eye.Box..The.three.dimensional.volume.in. DEB

space.surrounding.the.Design.Eye.Position.from.

which.the.HUD.information.can.be.viewed.

A.navigation.system.widely.used.by.shipping.in. DECCA

Europe..The.ground.facilities.consist.of.a.master.

station.and.several.slave.stations.

Base-10.counting.system..Numbers.include.0,.1,. Decimal

2,.3,.4,.5,.6,.7,.8,.9.

Dedicated ded

30

Digital Expandable Flight Data Acquisition and DEFDARS

Recording.System

Deflection DEFL

Degree DEG

Delete DEL

An.ACARS.mode.of.operation.in.which. Demand Mode

communications.may.be.initiated.by.the.ground.

processor.or.the.airborne.system.

(.1.).Departure.. DEP

(.2.).Design.Eye.Position..The.position.at.each.

pilot’s.station.from.which.a.seated.pilot.achieves.

the.optimum.combination.of.outside.visibility.and.

instrument.scan.

Designated.Engineering.Representative:. DER

Designation.of.authority.by.the.FAA.authorized.

under.FAR.Part.183,.Subpart.B.

Descent DES

Description DESCR

TCAS.sensitivity.level.(threat.volume).reduction Desensitization

Descent:.An.autopilot.Flight.director.mode. DES

Destination DEST

Deviation DEV

Definition File DF

Direction.Finding.Antenna DFA

Digital.Flight.Control.System DFCS

Digital Flight Data Acquisition Function DFDAF

Digital Flight Data Acquisition Management Unit DFDAMU

Digital Flight Data Acquisition Unit. The DFDAU DFDAU

samples, conditions and digitizes the flight data.

Digital.Flight.Data.Recorder DFDR

Digital.Flight.Data.Unit DFDU

Dual.Function.Interactive.Display.Unit DFIDU

Digital.Flight.Instrument.Unit DFIU

Digital Frequency Select DFS

3_

Digital.Function.Unit DFU

Directional.Gyro:.Mode.of.AHS.operation.that. DG

provides heading data without the benefit of a flux

(AHRS).or.normal.alignment.(IRS).

Direction.Generale.de.l’Avaiation.Civile.(France’s. DGAC

Civil.Aviation.Agency).

Differential.Global.Navigation.Satellite.System DGNSS

Differential.Global.Positioning.System. DGPS

( 1 ) Dataflash Header . DH

( 2 ) Decision Height: Specified height in the

precision.approach.at.which.a.missed.approach. must be initiated if the required visual reference to

continue.the.approach.has.not.been.established.

Data.Interrupt DI

Diagrams DIAGS

Digital.Interface.Box DIB

Data.Item.Description DID

(.1.).Data.Interrupt.Program.. DIP

(.2.).Dual.In-line.Package..The.most.common.

package configuration for integrated circuits.

(.1.).Direct.. DIR

(.2.).Director..

(.3.).Direction

A.DME.operating.mode.that.allows.an.FMCS.to. Directed Mode

select one to five DME stations for interrogation.

Direct.Intercept DIR/INTC

Disconnect DISC

Discharge DISCH

Discrepancy DISCR

A.general.term.for.a.single.wire.signal.that.is. DISCRETES

either.off.or.on.

Display DISP

Distance DIST

Data.Information.Transfer.System DITS

3_

(.1.).Data.Link.. DL

(.2.).Downlink

Data.Link.Application.Processor DLAP

Data.Link.Control.Display.Unit DLC

Data Link Control Identifier DLCI

Data.Link.Entity DLE

Data.Load.Gateway.Function DLGF

Data.Link.Interpreter.program DLI

Data.Link.(AEEC) DLK

(.1.).Data.Link.Library.. DLL

(.2.).Dynamic.Link.Library

Data.Link.Management.Unit DLM

Data.Link.and.Message.Engineering DLME

Data.Loader/Mass.Storage.Unit DL/MSU

Duct Leak and Overheat Detection DLODS

Data.Link.Processor DLP

Data.Load.System DLS

Data.Link.Service.Provider DLSP

Digital.Lineal.Tape-used.for.the.storage.of.video. DLT

and audio files

Download.Unit DLU

Disconnected.Mode DM

Direct.Memory.Access DMA

Distance Measuring Equipment. A system that DME

provides.distance.information.from.a.ground.

station.to.an.aircraft.

Abbreviation.for.a.DME.normal.system DME/N

Abbreviation.for.a.DME.precision.system DME/P

In.this.mode,.the.DME.scans.from.0.mile.to. DME Search

the.outer.range.for.a.reply.pulse.pair.after.

transmitting.an.interrogation.pulse.pair.

Data.Management.Function DMF

33

Designated.Manufacturing.Inspection. DMIR

Representative

(.1.).Data.Memory.Module.. DMM

(.2.).Digital.Multimeter

Data.Multiplexing.Network DMN

Debris.Monitoring.Sensor DMS

Data.Management.Unit DMU

RTCA.Document.160,.Environmental.Conditions. DO-_60

and Test Procedures for Airborne Equipment,

Issued.12/04/89

RTCA.document.178,.Software.Considerations.in. DO-___ Airborne Systems and Equipment Certification,

Issued.03/22/85

Delegation Option Authorization: A delegation of DOA

authority.authorized.by.the.FAA.under.FAR.Part.

21,.Subpart.J.

Documentation DOC

Data Over Cable Service Interface Specifications DOCSIS

Department.of.Defense DOD

Dynamic Object Orientated Requirements System DOORS

The change in frequency observed at the receiver Doppler Effect

when.the.transmitter.and.receiver.are.in.motion.

relative.to.each.other.

Disk Operating System DOS

Department.of.Transportation DOT

Dynamic Ocean Tracking System DOTS

The.radio.transmission.path.downward.from.the. Downlink

aircraft.to.the.earth.

Departure.Procedures DP

Boeing.Engineering.Process.Council.Display. DPAT

Process.Action.Team

Digital.Passenger.Control.Unit DPCU

dots.per.inch Dpi

Decision.Point.Process DPP

34

Dual.Port.RAM DPR

Differential.Phase.Shift.Keying DPSK

Digital.Quartz.Gyro DQG

(.1.).Data.Reconing.. DR

(.2.).Data.Receptacle..

(.3.).Dead.Reckoning:.The.worst.degraded.

mode.of.FMS.navigation..DR.is.displayed.when.

no.raw.position.data.is.received.by.the.FMS.for.

a.set.time.delay..In.such.situations,.position.is.

computed.by.monitoring.speed.and.direction.

since.last.known.position.

Designated.Radio.Engineering.Representative. DRER

(FAA)

The.angle.between.heading.and.track..It.is.due.to. Drift Angle

the.effect.of.wind.currents..Sometimes.called.the.

crab.angle.

Document.Release.Notice DRN

Digital.Service.Access.Device DSAD

Defense System Acquisition Review Cycle DSARC

Double.Side.Band..An.AM.signal.with.the.carrier. DSB

removed. Requires the same bandwidth as the

AM.signal.

Data.Signal.Display.Unit DSDU

Display.System.Function DSF

(.1.).Digital.Signal.Processor.. DSP

(.2.).Display.Select.Panel.. ( 3 ) Domain Specific Part

Display.Driver DSPDRV

Display.(annunciation.on.CDU) DSPY

Display.System.Replacement DSR

Decision.Support.Systems DSS

Direct Sequence Spread Spectrum DSSS

Decision.Support.Tool DST

(.1.).Data.Signaling.Unit.. DSU

(.2.).Domain.Service.Unit

3_

Design.To.Cost DTC

(.1.).Data.Terminal.Display.. DTD

( 2 ) Document Type Definition

Data Terminal Equipment DTE

Development.Test.and.Evaluation DT&E

Distance-to-go DTG

Desired.Track DTK

Dual Tone Multi-Frequency DTMF

Demonstration.Test.Milestone DTM

Data.Protocol.Data.Unit DTPDU

Data.Transfer.Unit DTU

Display.Unit DU

An.airborne.DMERT.capable.of.processing.. Dual Mode DME

DME/N.and.DME/P.ground.station.signals..

Operation is in the L-band frequency range.

Direct.User.Access.Terminal DUAT

A.communication.operation.that.uses.the. Duplex

simultaneous.operation.of.the.transmit.and. receive equipment at two locations.

Demonstration.and.Validation.Facility DVF

Digital.Visual.Interface DVI

Digital.Voltmeter DVM

Direct.WAN DWAN

Distance DX

Dynamic.Pressure.is.the.difference.between.pitot. Dynamic

and.static.pressure. Pressure

RAM.constructed.of.capacitor.elements..Memory. Dynamic RAM

cells.must.be.periodically.refreshed.to.keep.

capacitors.from.discharging.and.losing.data...

(See.“Static.RAM”).

(.1.).East.. E

(.2.).Elevator

Experimental.Aircraft.Association EAA

Electronic.Attitude.Director.Indicator EADI

36

Enhanced.Airborne.Flight.Recorder EAFR

Engine.Anti-Ice EAI

Engine.Alert.Processor EAP

Electrically Alterable ROM EAROM

Engineering.Activity.Reporting.System EARS

En.route.Automated.Radar.Tracking.System EARTS

Equivalent Airspeed EAS

Europeon.Aviation.Safety.Agency EASA

Enhanced.ATM.and.Mode.S.Implementation.in. EASIE

Europe

European Air Traffic Control Harmonization and EATCHIP

Integration.Programme

European Air Traffic Management Systems EATMS

European.Business.Aviation.Convention.and. EBACE

Exhibition

Event.Criterion EC

European.Civil.Aviation.Conference ECAC

Electronic.Caution.Alert.Module ECAM

Enhanced.ACARS ECARS

Earth-Centered,.Earth-Fixed ECEF

The portion of the radiated energy reflected back Echo

to.the.antenna.from.the.target.(WXR).

Electronic.Checklist ECL

Electronic.Control.Module ECM

Electronic.Component.Management.System ECMP

Economy.(minimum.cost.speed.schedule) ECON

EICAS.Control.Panel ECP

(.1.).Engineering.Compiler.System..An.automated. ECS

data.storage.system...

(.2.).Environmental.Control.System.. ( 3 ) Event Criterion Subfield

Left.Environmental.Control.System.Card ECSL

ECS.Miscellaneous.Card ECSMC

3_

Right.Environmental.Control.System.Card ECSR

(.1.).EICAS.Control.Unit.. ECU

(.2.).Electronic.Control.Unit..

(.3.).External.Compensation.Unit

EICAS.Display ED

End-of-Descent E/D

Electronic.Design.Automation EDA

Error.Detection.and.Correction.(used. EDAC

interchangeably.with.EDC)

Error.Detection.and.Correction EDC

Electronic.Document.Distribution.Service EDDS

Electronic.Digital.Flight.Control.System EDFCS

Engine.Data.Interface EDI

Engine.Data.Interface.Function EDIF

Engine.Data.Interface.Unit EDIU

Electronic.Data.Management.System EDMS

(.1.).Electronic.Data.Processing.. EDP

(.2.).Engine.Driven.Pump..

(.3.).Engineering.Development.Pallet

Electronic.Display.Unit EDU

Electronic.Data.Services EDS

Electronics Equipment (e.g. EE-Bay) EE

Electronic.Engine.Control EEC

Electrical Erasable Programmable Read Only EEPROM

Memory

ELMS.Electronics.Unit EEU

Electronic.Flight.Bag EFB

Expected.Further.Clearance EFC

Electronic.Flight.Display EFD

Expanded.Flight.Data.Recorder EFDR

Electronic.Flight.Instrument.Controller EFIC

Electronic.Flight.Instrument.Processor EFIP

Electronic.Flight.Instrument.System EFIS

3_

EFIS.Control.Panel EFISCP

Enhanced.Flight.Vision.System EFVS

Expedited.Ground.Initiated.Handoff EGIHO

Evolved.Expendable.Launch.Vehicle EELV

European Geostationary Navigation Overlay EGNOS

System

Exterior.Gateway.Protocol EGP

Enhanced.Ground.Proximity.Warning.System EGPWS

Exhaust.Gas.Temperature EGT

Electronic.Horizontal.Situation.Indicator EHSI

Electro-Hydraulic.Valve EHV

Engine.Indication EI

Electronic.Industries.Association EIA

Engine.Indication.and.Crew.Alert.System:.System. EICAS

that.combines.engine.parameters.and.aircraft.

system.status.

Engine.Indication.and.Crew.Alert.System.Controls EICASC

Extended Initial Protocol Identifier EIPI

Earth.Incident.Radiated.Power EIRP

(.1.).Electronic.Instrument.System.. EIS

(.2.).Engine.Indication.System..

(.3.).Entry-In-Service

Extended.Industry.Standard.Architecture EISA

EFIS/EICAS.Interface.Unit EIU

Electronic.Logbook.and.Fault.Correction.Guide EL/FCG

Electronic.Logbook.In-Service.Evaluation ELB/ISE

Emitter.Coupled.Logic ELC

Electrical ELEC

Elevation ELEV

Extended.Length.Message ELM

Electrical.Load.Management.System ELMS

Electronic.Library.System ELS

39

Emergency.Locator.Transmitter ELT

Element.Manager EM

(.1.).Electromagnetic.Compatibility. EMC

(.2.).Entertainment.Multiplexer.Controller

Emergency EMER

Emergency EMG

Electro-Magnetic.Interference EMI

(.1.).Emergency.Medical.Services.. EMS

(.2.).Engine.Management.System

Engine ENG

Engineering Network Operations Center ENOC

Enquire ENQ

En.Route EN RTE

Engine-Out E/O

End Of Day EOD

End Of Message EOM

End Of Text EOT

External.Power EP

External.Power.Contactor EPC

Engine.Propulsion.Control.System EPCS

Electronic.Pilot.Reports E-PIREPS

The.E-Plane.is.the.plane.of.an.antenna.that. E-Plane

contains the electric field. The principal E-Plane

also.contains.the.direction.of.maximum.radiation.

Electrically.Programmable.Logic.Device EPLD

Enhanced.Parallel.Port EPP

Engine.Pressure.Ratio EPR

Erasable Programmable ROM EPROM

Electrical.Power.System EPS

Estimated.Position.Uncertainty EPU

Equipment EQUIP

40

Equivalent Airspeed is a direct measure of the Equivalent

incompressible.free.stream.of.dynamic.pressure. Airspeed

It.is.CAS.corrected.for.compressibility.effects. (EAS)

Echo.Reply.Protocol.Data.Unit ERPDU

European.Regional.Airlines.Association ERA

Engineering.Review.Board ERB

End.Routing.Domain ERD

En.Route.Domain.Infrastructure ERDI

External.Roll.Extrusion ERE

(.1.).Eye.Reference.Point.. ERP

(.2.).Enterprise.Resource.Planning

Echo.Reply.Protocol.Data.Unit ERPPDU

Echo Request Protocol Data Unit ERQPDU

Engine.Relay.Unit ERU

(.1.).End.System.. ES

( 2 ) Extended Squitter

European.Space.Agency ESA

(.1.).Electronic.Situation.Awareness.System. ESAS

(.2.).Enhanced.Situational.Awareness.System

Electronic.Scanning E-Scan

Electrostatic.Discharge ESD

Electrostatic.Sensitive.Devices..Also.known.as. ESDS

ESSD.

COTS Ethernet Switching Equipment ESE

End.System.Hello ESH

Engine.and.System.Indication.Display ESID

Engine.and.System.Indication.System ESIS

Energy.Storage/Control ESR

(.1.).Electronic.Switching.System.. ESS

(.2.).Environmental.Stress.Screening

Electro.Static.Sensitive.Devices..See.also.ESDS. ESSD

Environmental.Stress.Screen.Procedure ESSP

Estimated EST

4_

Environmental.Sensor.Unit ESU

Elapsed.Time ET

Estimated.Time.of.Arrival:.The.estimated.time. ETA

to.arrive.at.some.navigational.position.based.on.

present.position.and.estimated.ground.speed.

(.1.).End.of.Block.(ASC.II/IA5.character).. ETB

(.2.).Engineering.Test.Band

Estimated.Time.of.Departure ETD

Elapsed.Time.Indicator ETI

Elapsed.Time.Measurement ETM

Enhanced Traffic Management System ETMS

Extended Twin Engine Operations ETOPS

Equal Time Point ETP

Expected.Taxi.Ramp.Clearances ETRC

Enhanced.Terminal.Voice.Switch ETVS

(.1.).End.of.Transmission.. ETX

(.2.).Entry.Task.Exit

Enhanced.Upper.Air.Forecast.System EUAFS

External.Uninterruptible.Power.Supply EUPS

European EUR

European.ATN EURATN

European.Transport EURET

European Organization for Civil Aviation EurOCAE

Electronics..A.regulatory.agency.for.avionics.

certification in Europe.

European Organization for the Safety of Air EURO-

Navigation Operations CONTROL

Earned.Value EV

Error.Vector.Magnitude EVM

Enhanced.Vision.System EVS

Executive EXEC

Extension EXT

4_

A probability of occurrence less than or equal Extremely

to 1 x 10^-9 per hour of flight, or per event (e.g. Improbable

takeoff,.landing)..(AMJ.52.1309).

A.probability.of.occurrence.greater.than.1.x. Extremely

10^-9 but less than or equal to 1 x 10^-7 hour of Remote

flight, or per e vent (e.g., takeoff, landing) (AMJ

25.1309).

Fahrenheit F

Final.Approach FA

(.1.).Federal.Aviation.Administration.(U.S.). FAA

(.2.).Federal.Aviation.Authority

FAA.Technical.Center.(U.S.) FAATC

(.1.).Flight.Augmentation.Computer.. FAC

(.2.).Final.Approach.Course

Full.Authority.Digital.Electronic.Control FADEC

Final.Approach.Fix FAF

First.Article.Inspection FAI

System capable of completing the specified Fail Operation

phases.of.an.operation.following.the.failure.of.any. System

single.system.component.after.passing.a.point.

designated.by.the.applicable.safety.analysis.(e.g.,.

Alert.Height).

System.which,.in.the.event.of.a.failure,.causes.no. Fail Passive

significant deviation of aircraft. System

A.single.failure,.should.not:.. Fail Passive

( 1 ) Cause significant displacement of the aircraft (Collins

Autopilot) from.its.approach.path.or.altitude.loss.below.the.

nominal.glidepath...

(.2.).Upon.system.disconnection,.involve.any.out-

of-trim.condition.not.easily.controlled.by.the.pilot... ( 3 ) Cause any action of the flight control system

that.is.not.readily.apparent.to.the.pilot,.either.by.

control.movement.or.advisory.display.

43

(.a.).Fail.safe.means.that.the.structure.has.been. Fail Safe

evaluated.to.assure.that.catastrophic.failure.is.not.

probable.after.fatigue.failure.or.obvious.partial.

failure.of.a.single,.principal.structural.element...

(.b.).Fail.safe.means.that.an.Autopilot.complies.

with the requirements of AC25.1329-1A.

Limited.aircraft.disturbance.for.any.single.fault- Fail Soft

less.than.0.4.in.pitch.and.less.than.5.deg/sec.of. (Collins

Autopilot) roll.rate.

A marker beacon used to provide identification Fan Marker

of.positions.along.airways..Standard.fan.marker.

produces.an.elliptical-shaped.pattern...A.second.

type.produces.a.dumbbell-shaped.pattern.

Future.Air.Navigation.System FANS

Final.Approach.Point FAP

( 1 ) Federal Acquisition Regulation. FAR

(.2.).Federal.Aviation.Regulation

Final.Approach.Segment FAS

Final.Approach.Spacing.Tool FAST

Factory.Acceptance.Test FAT

Fly-By-Light FBL

Fixed Base Operator FBO

Fly-By-Wire FBW

Foot.Candles FC

Functional Configuration Audit FCA

Flight Data Acquisition FCAF

Fibre.Channel-Audio.Video FC-AV

(.1.).Federal.Communications.Commission.. FCC

(.2.).Flight.Control.Computer

Flight.Critical.dc FCDC

Flight Crew Operating Manual FCOM

(.1.).Flight.Control.Panel.. FCP

(.2.).Flight.Control.Processor

(.1.).Flight.Control.System.. FCS ( 2 ) Frame Check Sequence

44

(.1.).Final.Data.. FD

(.2.).Flight.Director..

(.3.).Flight.Dynamics..

(.4.).Forward.Display

Flight Data Acquisition Function FDAF

Flight Data Acquisition Unit FDAU

Flight.Plan.Data.Bank FDB

(.1.).Flight.Detection.Exclusion.. FDE

(.2.).Flight.Deck.Enhancement

Fiber.Distributed.Data.Interface FDDI

Flight.Data.Entry.Panel FDEP

Flight.Deck.Handset FDH

Fault.Detection.and.Isolation FDI

Flight Data Input/Output FDIO

Frequency Division Multiplex. A system where the FDM

messages.are.transmitted.over.a.common.path.

by employing a different frequency band for each

signal.

Frequency Division Multiple Access FDMA

Flight.Data.Processing.System FDPS

Flight.Data.Recorder FDR

Flight.Data.Recorder.System FDRS

Flight.Display.System FDS

Flux.Detector.Unit FDU

Future European Air Traffic Management System FEATS

Forward.Error.Correction FEC

Front.End.Processor FEP

Fuel.Flow FF

Free.Flight.Steering.Committee FFSC

Flight.Guidance.Computer FGC

Flight.Guidance.Panel:.A.LRU.used.for.controlling. FGP

the modes of the flight director.

Flight.Guidance.System FGS

4_

(.1.).Functional.Hazard.Assessment/Analysis.. FHA

(.2.).Fault.Hazard.Assessment

Frequency Hopped Spread Spectrum FHSS

Fault.History.Word FHW

Forwarding.Information.Base FIB

First In , First Out FIFO

Fault.Isolation.Manual FIM

Flight.Information.Region FIR

(.1.).Flight.Information.Service.. FIS

(.2.).Flight.Information.System..

(.3.).Flight.Instrument.System

Flight.Information.Services-Broadcast FIS-B

Position in space, usually on aircraft’s flight plan FIX

(.1.).Flight.Level.(as.in.FL.410.)..This.terminology. FL

is.used.to.describe.aircraft.attitude.when.the.

altimeter.is.set.at.QNE...

(.2.).Foot.Lambert

Flight.Level.180:.The.transition.altitude.(18,000.ft). FL __0

for.the.United.States..At.this.altitude,.the.pilot.sets.

the.barometric.correction.to.standard.atmospheric.

pressure.(29.92.in-Hg).

Flight.Level.Change FLCH

Forward.Looking.Infra-Red FLIR

Flight.Line.Maintenance FLM

Flight FLT

Forward.Looking.Terrain.Avoidance FLTA

Flight.Control FLTCTRL

Flight.Instrument FLTINST

Forward.Looking.Windshear.Radar FLW

( 1 ) Frequency Modulation . FM

(.2.).Flight.Management

Flight.Mode.Annunciator FMA

(.1.).Flight.Director.Control.(FD). FMC

(.2.).Flight.Management.Computer.(FMCS)

46

Flight.Management.Computer.Function FMCF

Flight.Management.Computer.System FMCS

Frequency-Modulated Continuous Wave FMCW

Failure.Mode.and.Effects.Analysis FMEA

Flight.Management.Function FMF

Flight.Mode.Panel FMP

Flight.Management.System FMS

Fuel.Metering.Unit FMU

( 1 ) First Officer . F/O

( 2 ) Fuel/Oil Cooler .

( 3 ) Fiber Optic

Fuel.on.Board FOB

( 1 ) Fuel/Oil Cooler . FOC

( 2 ) Full Operational Capability

Flight Operations Evaluation Board FOEB

Fiber Optic Gyro FOG

Flight Operations Quality Assurance FOQA

Field Of View FOV

(.1.).Flight.Path.Angle.. FPA

(.2.).Focal.Plane.Array

Flight.Path.Acceleration FPAC

Flight Profile Comparator FPC

Field.Programmable.Gate.Array FPGA

Flight.Plan FPLN

Feet.Per.Minute FPM

Flight.Plan.Target.Altitude FPTA

Flight.Path.Vector FPV

Fuel.Quantity.Indicating.System FQIS

Fuel.Quantity.Processor.Unit FQPU

Formal Qualification Review FQR

From FR

Flap.Retract.ion.Altitude FRA

4_

Frame.Relay.Access.Device FRAD

A.pulse.that.is.used.to.mark.the.beginning.or.end. Framing Pulse

of.the.coded.reply.pulses.

Free-Route.Experimental.Encounter.Resolution FREER

A.DME.operating.mode.that.will.provide.distance. Free Scan

data.to.all.DME.ground.stations.within.the.DME. Mode

range (LOS).

Frequency FREQ

The.ability.of.a.receiver-transmitter.to.rapidly.and. Frequency

continually shift operating frequency.

Fault.Reporting.Manual FRM

Frame.Reject FRMR

ILS.approach.made.from.the.end.of.the.runway. FRONT-

for.which.the.localizer.is.calibrated..Uses.both. COURSE

localizer.and.the.glideslope.

Federal.Radionavigation.Plan FRP

Fixed.Reception.Pattern.Antenna FRPA

Frequency FRQ

Flight.Service.Automation.System FSAS

Flight.Standardization.Board FSB

Field.Service.Engineer FSE

Flap.Slat.Electronics.Unit FSEU

Flight.Safety.Foundation FSF

Flight.Service.Station FSS

File.Server.Unit FSU

(.1.).Functional.Test.. FT

(.2.).Feet

Flight.Technical.Error:.The.accuracy.with.which. FTE

the.aircraft.is.controlled.as.measured.by.the.

indicated.aircraft.position.with.respect.to.the.

indicated.command.or.desired.position..It.does.

not.include.blunder.errors.

File.Transfer.Protocol FTP

Fault.Tolerant.Power.Panel FTPP

4_

Flexible.Use.Airspace FUA

Failure.Warning FW

Flight.Warning.Computer FWC

Forward FWD

Flight.Warning.System FWS

Flight.Director/Yaw.Damper.System FYDS

Gallium.Arsenide.Field.Affect.Transistor GaAsFET

(.1.).General.Aviation.. GA

(.2.).Go.Around

Gallium.Arsenide GAAS

Genetic.ATN.Communications.Service GACS

Ground-based.Augmentation.and.Integrity GAIT

General.Aviation.Manufacturers.Association GAMA

Global.Area.Network GAN

Global Air Traffic Management GATM

Ground.Based.Augmentation.System GBAS

Ground-Based.Software.Tool GBST

Gigabyte.(billion.bytes) Gbyte

Ground.Collision.Avoidance.System GCAS

Generator.Circuit.Breaker GCB

Ground.Cluster.Controller.(ACARS) GCC

Global.Component.Information.System GCIS

Generic.Control.Panel.(circuit.card) GCP

Ground.Clutter.Suppression GCS

Generator.Control.Unit GCU

Ground.Data.Link.Processor GDLP

Geometric Dilution Of Precision. A term referring GDOP

to.error.introduced.in.a.GPS.calculation.due.to.

the.positioning.of.the.satellites.and.the.receiver.

Ground.Delay.Program GDP

Graphics.Engine.4 GE4

Generator GEN

49

Geostationary Earth Orbit GEO

Ground.Earth.Station GES

Government Furnished Equipment GFE

General Format Identifier GFI

Gaussian Frequency Shift Keying GFSK

(.1.).Graphics.Generator.. GG

(.2.).Ground-Ground

Graphics.Generator.Module GGM

Ground-Ground Traffic Flow Management GGTFM

Ground-Ground.Router GGR

Global.Positioning.System.Ground.Station GGS

Ground.Handling GH

Gigahertz.(billion.hertz) GHz

Group Identifier GI

GNSS.Integrity.Broadcast GIB

GNSS.Integrity.Channel GIC

Ground-Initiated.Comm-B GICB

Garbage-In Garbage-Out GIGO

Ground.Initiated.Handoff GIHO

(.1.).Ground.Location.(ACARS/AFEPS).. GL

(.2.).Group.Length

The.approach.path.used.by.an.aircraft.during.an. Glidepath

instrument.landing.or.the.portion.of.the.glideslope.

that.intersects.the.localizer..The.glide.path.does.

not.provide.guidance.completely.to.a.touch.down.

point.on.the.runway.

The.vertical.guidance.portion.of.an.ILS.system. Glideslope

GPS.Landing.and.Navigation.System GLNS

GPS.Landing.and.Navigation.Unit GLNU

Global.Navigation.Satellite.System GLONASS

(.1.).GPS/GNSS.Landing.System.. GLS

(.2.).Gun.Laying.System

GPS/GNSS.Landing.Unit GLU

_0

Guidance.Material GM

Ground.Movement.Control GMC

Greenwich.Mean.Time..GMT.is.a.universal.time. GMT

scale.based.upon.the.mean.angle.of.rotation.of.

the.earth.about.its.axis.in.relation.to.the.sun..It.

is.referenced.to.the.prime.meridian.that.passes.

through.Greenwich,.England.

Global.Network.Architecture GMU

Ground GND

Gross.Navigational.Error GNE

GNSS.Navigator.and.Landing.System GNLS

GNSS.Navigator.and.Landing.Unit GNLU

Global.Navigation.Receiver GNR

Global.Navigation.Satellite.System GNSS

Global.Navigation.Satellite.System.Panel GNSSP

GNSS.Navigator.Unit GNU

A.device.that.combines.the.two.signals.from.two. Goniometer

loop.antennas..The.goniometer.(or.resolver). contains two fixed coils and one rotating coil.

The.rotating.coil.is.connected.to.the.ADF.

bearing.indicator.needle.to.indicate.the.relative.

bearing.from.the.aircraft.to.the.NDB.station..

The.mechanical.position.of.the.rotor.represents.

the.bearing.of.the.station,.and.the.position.is.

electrically.transmitted.to.the.RMI.

Grade.of.Service GOS

Government Open Systems Interconnection GOSIP

Profile

Glide.Path.Angle:.The.angle.between.the.ground. GPA

and.the.glidepath..Similar.concept.to.glideslope.

angle.

Global.Positioning,.Air.Data,.Inertial.Reference. GPADIRS

System

Gigabits.per.second Gbps

General.Purpose.Instrument.Bus GPIB

__

General.Purpose.Module GPM

General.Purpose.Processor GPP

(.1.).Global.Positioning.System.(See.NAVSTAR).. GPS

(.2.).Global.Positioning.Satellite

Global Positioning System L1 Frequency GPS L_

Global.Positioning.System.Sensor.Unit GPSSU

Ground.Power.Unit GPU

Ground.Proximity.Warning.Computer GPWC

Ground.Proximity.Warning.System GPWS

Ground.Router GR

Gridded.Binary.(National.Weather.Service.Model. GRIB

Output)

The rate at which a variable quantity increases or Gradient

decreases.

Special.binary.code.used.to.transmit.altitude. Gray Code

data.between.framing.pulses.of.a.transponder.

reply..A.cyclic.code.having.only.one.digit.change.

at.a.time..Used.in.Mode.C.to.transmit.aircraft.

barometric.altitude..Also.known.as.Gilham.code.

A.radio.wave.that.travels.along.the.earth’s. Ground Wave

surface.

Geographic.Reference.Point GRP

(.1.).Glideslope:.Radio.signal.that.provides. GS

vertical.guidance.in.an.instrument.landing...

(.2.).Ground.Speed

Glideslope:.Radio.signal.that.provides.vertical. G/S

guidance.in.an.instrument.landing.

Ground.Station.Controller.(ACARS) GSC

Ground Support Equipment GSE

Ground.Station.Information.Frame GSIF

Global.Systems.Mobile GSM

Ground.Station.Management.System GSMS

Glare.Shield.Panel GSP

Gray.Scale.Voltage(s) GSV

__

Greater.Than GT

General.Terms.Agreement GTA

Data.Link.Ground.Terminal.Computer GTC

General Technical Requirements GTR

Graphic/User.Interface GUI

Graphics.Vector.Engine GVE

(.1.).Gateway.. GW

(.2.).Gross.Weight

Graphical.Weather.Services GWS

A.rotating.device.that.will.maintain.its.original. Gyroscope

plane.of.rotation,.no.matter.which.direct.ion.the.

gyroscope.mount.is.turned.

Hardware.Architecture.Document HAD

Means.there.is.a.thin.black.line.(halo).around. “Halo”

the.symbol.or.character..Haloing.is.used.when.

appropriate.to.allow.characters.and/or.symbols.to.

be.clearly.seen.when.they.are.displayed.against.a.

solid.background.color.(Such.as.the.Sky/Ground).

Highly.Accelerated.Life.Testing HALT

Hot.Air.Management.System HAMS

HGS.Annunciator.Panel HAP

High.Altitude.Route.System HARS

Height.Above.Touchdown HAT

HGS.Computer HC

(.1.).Head-Up.Control.Panel. HCP

(.2.).HGS.Control.Panel

Human.Computer.Interface HCI

Host.Computer.System HCS

HUD.Combiner.Unit HCU

Heavily.Cold.Worked.Pipe.and.Tube.. HCW

(Sean-Free™)

Handbook HDBK

Head.Down.Display HDD

_3

Heading:.The.angular.relation.of.the.longitudinal. HDG

axis.of.the.aircraft.with.respect.to.a.reference..

Magnetic.heading.is.referenced.to.magnetic.

north..True.heading.is.reference.to.true.north.

Heading.Select HDGSEL

Hard.Disk HDISK

Hybrid.Data.Link HDL

High-Level.Data.Link.Control HDLC

High-Level.Data.Link.Control-Balanced HDLC-B

Hybrid.Data.Link.Management.System HDLMS

Horizontal.Dilution.of.Precision HDOP

Inertial.Vertical.Speed HDOT

Hardware.Development.Plan HDP

Altitude.Error HE

The.direction.of.an.aircraft.path.with.respect.to. Heading

magnetic.or.true.north.

High Energy Radio Frequency Interference HERF

( 1 ) High Frequency. The portion of the radio HF

spectrum.from.3.to.30.MHz..HF.communication.

systems.operate.in.the.2.to.30.MHz.portion.of.the.

spectrum...

(.2.).Human.Factors

High-Frequency Data Link HFDL

HF.Data.Modem HFDM

High Frequency Data Radio HFDR

High Frequency Network Protocol Data Unit HFNPDU

High Frequency System HFS

Human.Factor.Study.Group HFSG

HF.Sub.Network.Layer HFSNL

High.Gain.Antenna HGA

Head-Up.Guidance.Computer HGC

(.1.).Head-Up.Guidance.System.. HGS

(.2.).HUD.Guidance.System

_4

Heading.Hold HHLD

High HI

(.1.).Head.Impact.Criteria. HIC

(.2.).Head.Injury.Criteria

Horizontal.Integrity.Limit HIL

(.1.).High.Intensity.Radiated.Field. HIRF

( 2 ) High Intensity Radio Frequency

High.Lift.Control.System HLCS

Higher.Layer.Entity HLE

High.Level.Language HLL

Health.Management HM

Health.Management.Function HMF

Human.Machine.Interface HMI

High Density Metal Oxide Semiconductor HMOS

Height.Monitoring.Unit HMU

Handoff HO

Holding.Pattern HOLD

Hand Over Word HOW

(.1.).High.Pressure.. HP

(.2.).Holding.Pattern

( 1 ) High Power Amplifier . HPA

(.2.).HectoPascal:.A.unit.of.pressure.in.the..

meter-kilogram-second.system..(Hecto=100)..

(1 Pascal=1 Newton per square meter).

hecto.Pascal hPa

High.Pressure.Compressor HPC

The.H-Plane.is.the.plane.in.which.the.magnetic. H-Plane field of the antenna lies. The H-Plane is

perpendicular.to.the.E-Plane.

High-Power.Relay HPR

Pressure.Altitude HPRES

High-Pressure.Shutoff.Valve HPSOV

High-Pressure.Turbine HPT

__

HUD.Projector.Unit HPU

Home.Routing.Domain HRD

Horizontal.Stabilizer.Actuator HSA

Horizontal.Stabilizer.Actuator.Control.Electronics HSACE

High.Speed.Frame.Relay.Service.Access.Device HS-DSAD

Horizontal.Situation.Indicator..An.indicator.that. HSI

displays.bearing,.glideslope,.distance,.radio.

source,.course.and.heading.information.

Hardware.and.Software.Integration.Test HSIT

Heading.Select HSL

High.Stability.Reference HSR

Hot.Standby.Routing.Protocol HSRP

High.Speed.Transceivers HST

Horizontal.Stabilizer.Trim.Actuator HSTA

Highest.Two-way.Channel HTC

Head-Up.Display HUD

High-Voltage.Power.Supply HVPS

Hardware HW

Hardware Configuration Item HWCI

Headwind HWND

Hardware/Software HW/SW

Heat.Exchanger HX

Hydraulic HYD

Hydraulic.Interface.Module HYDIM

Hertz.(cycles.per.second) Hz

Integrated.Information.System I_S

International.Aeronautical.Communications. IACSP

Service.Provider

Interface I/F

International.Alphabet.Number.5 IA_

Integrated.ARINC.Ground.Station IAGS

Internet.Assigned.Number.Authority IANA

_6

Indicated.Angle-of-Attack IAOA

International Council of Aircraft Owners and Pilots IAOPA

Associations

Instrument.Approach.Procedures.Automation IAPA

Integrated.Avionics.Processing.System IAPS

Inverse.Address.Resolution.Protocol IARP

Indicated.Airspeed.is.the.speed.indicated.by. IAS

a.differential.pressure.airspeed.indicator.that.

measures.the.actual.pressure.differential.in.

the.pitot-static.head..It.is.the.actual.instrument. indication for a given flight condition.

IAS Profile: An autopilot/flight director mode that IASP commands the aircraft to fly pre-programmed

airspeed.values.

International.Air.Transport.Association IATA

In.Accordance.With IAW

International.Business.Aviation.Council IBAC

(.1.).Integrated.Circuit.. IC

(.2.).Intercabinet

International Civil Aviation Organization ICAO

(Montreal)

IAPS.Card.Cage ICC

International Civil Certification Authorities ICCA

International.Coordinating.Council.of.Aerospace. ICCAIA

Industries

(.1.).Installation.Control.Drawing. ICD

(.2.).Interface.Control.Drawing.

(.3.).Interactive.Design.Center

Interline.Communications.Manual ICM

Internet.Control.Message.Protocol ICMP

Integrated.Communication.s,.Navigation.and. ICNIA

Identification Avionics

Initial Conflict Probe ICP

Integrated.Communication.Switching.System ICSS

__

Instrument.Comparator.Unit ICU

Identifier ID

Indicator.Display/Control IDC

Integrated.Development.Environment IDE

The.action.of.the.transponder.transmitting.an. Ident

extra pulse along with its identification code (at

the request of a controller).

Initial Domain Identifier IDI

Integrated.Drive.Generator IDG

Integrated.Decision.Making IDM

Initial.Domain.Part IDP

Inter-Domain.Routing.Protocol IDRP

(.1.).Ice.Detection.System.. IDS

(.2.).Integrated.Display.System..

(.3.).Information.Display.System

Interactive.Display.Unit IDU

IAPS.Environmental.Control.Module IEC

Insertion.Extraction.Device IED

Institute.of.Electrical.and.Electronics.Engineers IEEE

Integrated.Engine.Pressure.Ratio IEPR

Interactive.Electronic.Training.Manual IETM

Intermediate Frequency. A frequency to which IF(if)

a.signal.is.shifted.as.an.in-between.step.in.the.

reception.or.transmission.of.a.signal.

International.Federation.of.Airline.Pilots. IFALPA

Association

International Federation of Air Traffic Controllers’ IFATCA

Associations

In-Flight.Entertainment IFE

Integrated.Initial.Flight.Plan.Processing.System IFPS

Instrument.Flight.Rules IFR

International Frequency Registration Board IFRB

Intermediate.Gain.Antenna IGA

__

Standardized.Graphics.Exchange.File IGES

Interagency.Group.on.International.Aviation IGIA

Integrated.Ground.Software IGS

Inlet.Guide.Vane IGV

Independent.Landing.Monitor ILM

Instrument.Landing.System..The.system.provides. ILS

lateral,.a.long-course.and.vertical.guidance.to.

aircraft.attempting.a.landing.

Inner.Marker.Beacon:.When.present,.MB.used. IM

in.conjunction.with.ILS,.intercepts.glideslope.

approximately.100.feet.above.touchdown.

Integrated.Modular.Avionics IMA

Integrated.Mission.Avionics.System IMAS

Instrument.Meteorological.Conditions IMC

Implementation.Management.Group IMG

Imbedded Message Identifier IMI

I’m Okay IMOK

Impact.Avalanche.and.Transmit.Time..This. IMPATT Diode

type.of.diode,.when.mounted.in.an.appropriate.

cavity,.produces.microwave.oscillations.and. amplification.

Integrated.Master.Schedule IMS

(.1.).Inertial.Measurement.Unit.. IMU

(.2.).IF.Multiplexer.Unit.In.Inch

(.1.).Inboard.. INBD

(.2.).Inbound

Indicator IND

The.altitude.above.mean.sea.level.(uncorrected. Indicated

for.temperature). Altitude

Information.Frame INFO

Inches.of.Mercury in.hg.

Initialization INIT

Injection INJ

International Maritime Satellite Organization INMARSAT

_9

Inoperative;.not.working. INOP

Interphone INPH

Inertial.Navigation.System..A.self-contained,. INS

dead-reckoning.system.that.senses.the.

acceleration.along.the.three.axes.of.the.aircraft.

and.calculates.the.distance.traveled.from.

a.reference.point..Accuracy.of.the.system.

decreases.with.respect.to.time.

Instrument INST

Intercept INTC

Internet.Network.Information.Center Interknit

Intersections INTERS

An.altitude.reporting.aircraft.that.is.being. Intruder

considered.as.a.potential.threat.and.processed.

by.the.threat.detection.logic.(TCAS).

A video display technique that surrounds Inverse Video

characters.or.digits.with.a.color.rather.than.

creating.those.characters.or.digits.from.a.color.

(i.e.,.black.characters.are.created.by.a.red.

background.rather.than.writing.red.characters).

Input/Output. Refers to bi-directional data ports. I/O

( 1 ) Initial Operational Capability. IOC

( 2 ) Input/Output Concentrator.

( 3 ) Input/Output Controller

Institute.of.Navigation ION

Indian Ocean Region IOR

Internet Operating System IOS

Initial Operational Test and Evaluation IOT&E

(.1.).Instructor.Pilot.. IP

(.2.).Intermediate.Pressure..

(.3.).Internet.Protocol..

(.4.).Intellectual.Property

Informational Pacific Air Traffic Control IPACG

Coordinating.Group

Illustrated.Parts.Breakdown IPB

60

(.1.).Illustrated.Parts.Catalog. IPC

(.2.).Integrated.Processing.Cabinet.

(.3.).Intermediate.Pressure.Compressor

(.1.).Industrial.Products.Division. IPD

(.2.).Integrated.Product.Delivery

Initial Protocol Identifier IPI

Illustrated.Parts.List IPL

Integrated.Performance.Management IPM

Internet.Protocol.Router IPR

In-Plane-Switching IPS

(.1.).Intermediate.Pressure.Turbine.. IPT

(.2.).Integrated.Product.Team

Infrared IR

Integrated.Receiver/Decoder IRD

Internal.Roll.Extrusion IRE

Integrated.Refuel.Panel IRP

(.1.).Inertial.Reference.System. IRS

( 2 ) Interface Requirements Specification

Inertial.Reference.Unit IRU

(.1.).Industry.Standard.Architecture. ISA

(.2.).International.Standard.Atmosphere

Integrated.Systems.Controller ISC

Integrated.Services.Digital.Network ISDN

Information System Design and Optimization ISDOS

System

In-Service.Data.System ISDS

Intermediate.System.Hello ISH

Isolation ISLN

( 1 ) International Organization for ISO

Standardization.

( 2 ) International Standards Organization .

(.3.).Isolation

Refer.to.contour Iso-Contour

ISO Protocol Architecture ISOPA

6_

Intersound.Quality.Control.facility..Facility.that. ISQC

checks,.labels.and.distributes.all.video.cassettes.

(.1.).Integrated.Switching.Panel. ISP

(.2.).Internet.Service.Provider

Interrupt.Service.Routine ISR

(.1.).Impending.Stall.Speed.. ISS

(.2.).Integrated.Surveillance.System

Intermediate.System.Subnetwork ISSN

Integrated.Surveillance.System.Processor.Unit ISSPU

Initial.Signal.Unit ISU

Institute.of.Air.Transport ITA

Information.Technology.Management.is.the. ITM

ground.based.portion.of.an.ADMS.(See.also.

EDMS.).

Indium-Tin Oxide ITO

Integrated.Test.System ITS

Integrated.Test.and.Support.Environment ITSE

(.1.).Interstage.Turbine.Temperature. ITT

(.2.).Inter-Turbine.Temperature

International.Telecommunications.Union ITU

Internal.Uninterruptible.Power.Supply IUPS

Isolation.Valve IV

Interchangeable.Virtual.Instrumentation IVI

Instantaneous.Vertical.Speed.Indicator IVSI

Integrated.Terminal.Weather.System ITWS

Joint.Aviation.Authority JAA

Joint Airworthiness Requirement JAR

Joint Airworthiness Requirements–All Weather JAR-AWO

Operations

Jet.Assisted.Takeoff JAO

Joint Conceptual Definition Phase JCDP

Joint.Development.Concept.Phase JDCP

Joint Definition Phase JDP

6_

Junction.Field.Effect.Transistor JFET

Joint.Photographic.Experts.Group JPEG

Journal.Processing.System JPS

Jammer.to.Signal.Ratio J/S

Joint.System.Acceptance.Test JSAT

Joint.Test.Action.Group JTAG

Joint.Tactical.Information.Distribution.System JTIDS

Kilo-Bytes.(thousand.bytes) KB

Kilobits KBITS

Kilobits.per.second Kbps

Kilobits.Per.Second kb/s

Keyboard.Unit KBU

A.hand-operated.switching.device.or.the.act.of. Key

operating.such.a.device.

Kilogram KG

Kilohertz.(1000.cycles.per.second) kHz

Kilometer km

Key.Performance.Indicators KPI

Kilobytes.Per.Second KPS

Knots kts

Kilovolt-ampere kVA

Kilowatt kW

Left L

L-Band.carrier.(1575.42.MHz) L_

L-Band.carrier.(1227.6.MHz) L_

Civil Satellite Frequency L_

Local.Area.Augmentation.System LAAS

Laboratory Lab

Local.Area.Differential.GPS LADGPS

Local.Area.Network LAN

Link.Access.Protocol-Balanced LAPB

63

Latitude LAT

A radio frequency band from 390 to 1,550 MHz L-Band

Pounds LBS

Layered.Component.Architecture LCA

Leadless.Chip.Carrier LCC

Liquid Crystal Display LCD

Link.Control.Field LCF

Logical Channel Identifier LCI

Logic.Control.Module LCM

Local.Communications.Network LCN

Liquid Crystal on Silicon LCoS

Lighting.Control.Panel LCP

Link.Connection.Refusal LCR

Low.Cost.Simulation.Test.bed LCSTB

Life.Cycle.Value.Stream.Management LCVSM

Lower.Data LD

Localizer.Directional.Aid LDA

Leaded.Chip.Carrier LDCC

Local.Area.Differential.Global.Positioning.Satellite LDGPS

Long Distance Operational Control LDOC

Lightning.Detection.System LDS

Lamp.Driver.Unit LDU

Link.Establish LE

Light.Emitting.Diode LED

The section of the flight between two waypoints. Leg

Low Earth Orbiting LEO

Low Frequency. The frequency range from 30 to LF

300.kHz.

Large.Format.Display.System LFDS

Low Frequency Radio Range LFR

Low.Gain.Antenna LGA

64

Lightning.HIRF.Protection LHP

Left.Inboard LIB

Limit LIM

Limited.North.Atlantic.Regional.Air.Navigation LIMNATRAN

Long-Haul.Interfacility.Communications.System LINCS

Line.Impedance.Stabilization.Network LISN

Logical.Link.Control LLC

Liquid Level Measurement System LLMS

Left Lower Plug. Identifies the plug on the rear LLP

connector.of.an.avionics.unit.

List.of.Materials L/M

Link.Management.Entity LME

Logical.Management.Interface LMI

Locator.Middle.Marker..An.NDB.that.is.co-located. LMM

at.the.same.site.as.the.75.MHz.middle.marker.

beacon.

Left Middle Plug. Identifies the plug on the rear LMP

connector.of.an.avionics.unit.

Local.Mean.Time LMT

Low Noise Amplifier LNA

Lateral.Navigation LNAV

Low LO

Left Outboard LOB

Localizer..The.lateral.guidance.portion.of.an.ILS. LOC

system.

The.condition.that.exists.when.the.DME.receives. Lock-On

reply.pulses.to.at.least.50.percent.of.the.

interrogations..Valid.distance.information.is.then.

available.

Line Oriented Flight Training LOFT

Locator Outer Marker. An NDB that is co-located LOM

at.the.same.site.as.the.75.MHz.outer.marker.

beacon.

Longitude LON

6_

Line Of Position LOP

Long.Range.Navigation..A.system.using.a.ground. LORAN

facility.composed.of.a.master.station.and.a.

slave.station..The.airborne.receiver.computes.

the.position.of.the.aircraft.by.using.two.or.more. received master-slave pairs of signals. LORAN-A

operates at 1850, 1900, and 1950 kHz. LORAN-C

operates at 100 kHz. LORA N-A was replaced by

LORAN-C in 1980.

Long.Range.Navigation.System LORAN C

( 1 ) Line Of Sight. LOS

( 2 ) Line-Oriented Simulation

Linear.Polarization LP

Low-Pressure.Compressor LPC

Link.Protocol.Data.Unit LPDU

Low-Pressure.Turbine LPT

Localizer.Precision.Vertical LPV

(.1.).Low-Range.Radio.Altimeter. LRA or LRRA

(.2.).Line.Replaceable.Assembly

Long.Range.Cruise LRC

Line.Replaceable.Module LRM

Long.Range.Navigation LRN

Long.Range.Radar LRR

Line.Replaceable.Unit LRU

(.1.).Lower.Sideband..The.lower.side.band.is.the. LSB

difference in frequency between the AM carrier

signal.and.the.modulation.signal..

( 2 ) Least Significant Bit

Low.Speed.Cues:.Markings.on.the.airspeed.scale. LSC

associated.with.the.stall.speed.region.

Least Significant Digit LSD

Low-Speed.Frame.Relay.Service.Access.Device LS-DSAD

Low-Speed.Frame.Relay.Access.Device LS-FRAD

Large.Scale.Integration LSI

66

Line.Select.Key LSK

Local.Subnetwork LSN

Link.State.PDU LSP

Lowest.Two-way.Channel LTC

Long-Term.Image.Retention LTIR

Left Top Plug. Identifies the plug on the rear LTP

connector.of.an.avionics.unit.

Long-Term Verification Software LTVS

A fixed line placed on an indicator to indicate the Lubber Line

front-to-rear.axis.of.the.aircraft.

Lower.Sideband.Voice LV

Low-Voltage.Differential.Signaling LVDS

(.1.).Linear.Variable.Differential.Transformer.. LVDT

(.2.).Linear.Voltage.Differential.Transducer.(used.

with.aircraft.control.surface.servos).

Level.Change LVLCHG

Low.Voltage.Power.Supply LVPS

Low Visibility Take-Off LVTO

Long.Wavelength.Infra-Red LWIR

Lightning LX

Mach.Number M

Meter m

Maximum.Authorized.IFR.Altitude MAA

Medium.Access.Controller MAC

Mach.number.is.the.ratio.of.the.true.airspeed.to. Mach Number the speed of sound at a particular flight condition.

It is the chief criterion of airflow pattern and is

usually.represented.by.the.free-stream.steady-

state.value.

Magnetic Mag

The.bearing.with.respect.to.magnetic.north. Magnetic

Magnetic.Variation:.The.difference.between.True. MAGVAR

North.and.Magnetic.North.

6_

The.direction.north.as.determined.by.the.earth’s. Bearing

magnetic field. The reference direct ion for Magnetic North

measurement.of.magnetic.directions.

Maintenance MAINT

Mean.Administrative.and.Logistics.Delay.Time MALDT

Manual MAN

(.1.).Missed.Approach.Point. MAP

(.2.).Mode.Annunciator.Panel..

(.3.).Management.Authorization.Process

A.transmitter.operating.at.75.MHz.that.provides. Marker Beacon

identification of a particular position along an

airway.or.on.the.approach.to.an.instrument.

runway..The.marker.beacon.is.continuously..

tone-modulated.by.a.400-Hz,.a.1,300-Hz.or.

a.3,000-Hz.tone..Marker.beacons.along.an.

instrument.runway.provide.a.long-course.(range).

guidance.and.design.ate.when.an.aircraft.should.

be.at.a.certain.altitude.if.the.aircraft.is.following.

the.glide.path.

Mach/Airspeed.Indicator M/ASI

Minimum.Aviation.System.Performance. MASPS

Standards

Maintenance.Access.Terminal MAT

Modular.Avionics.Unit MAU

Missed.Approached.Waypoint MAWP

Maximum MAX

Maximum.engine.thrust.for.two-engine.climb MAX CLB

Maximum.engine.thrust.for.two-engine.cruise MAX CRZ

MLS.Azimuth:.A.ground.based.radio.that.provides. MAZ

lateral.guidance.during.an.MLS.landing.

Marker.Beacon MB

Model-Based.Development MBD

Multiple.Bit.Error MBE

Mega.bytes.per.Second Mbps

6_

(.1.).Master.Change.. MC

(.2.).Master.Caution

Minimum.Crossing.Altitude MCA

Microwave.Circuit.Board MCB

Mean.Cycles.Between.Failures MCBF

Maintenance.Control.Computer MCC

Multiple.Condition.Decision.Coverage MCDC

Maintenance.Control.Display.Panel MCDP

Multifunctional.Control.Display.Unit MCDU

Modular Cabinet Equipment MCE

Master.Caution.Light MCL

Manufacturing.Control.Number MCN

(.1.).Maintenance.Control.Panel. MCP

(.2.).Mode.Control.Panel

Max.Continuous.Thrust MCT

(.1.).Modular.Concept.Unit.(approximately.. MCU

1/8-ATR,.Airline.Transport.Rack)..

(.2.).Motor.Control.Unit.(used.in.auto.throttle)..

(.3.).Multifunction.Concept.Unit

Minimum.Descent.Altitude MDA

Maintenance.Diagnostic.Computer:.A.computer. MDC

that.monitors.for.failures.of.others.systems.

Meteorological.Data.Collection.and.Reporting. MDCRS

Service

Minimum Descent Height. A specified height in MDH

a.non-precision.approach.or.circling.approach.

below.which.descent.must.not.be.made.without.

the required visual reference. Minimum Descent

Height.(MDH).is.referenced.to.aerodrome.

elevation.or.to.the.threshold.of.that.is.more.than.

7.feet.(2.m).below.the.aerodrome.elevation..A.

MDH.for.a.circling.approach.is.reference.to.the.

aerodrome.elevation.

Multipurpose.Data.Link MDL

69

(.1.).Minimum.Discernible.Signal..The.MDS.is.the. MDS

lowest.RF.signal.level.that.can.be.detected.as.a.

valid.signal...

(.2.).Maintenance.Diagnostic.Systems

Maintenance.Display.Terminal MDT

Minimum.En.route.Altitude MEA

Main Equipment Center MEC

Minimum Equipment List. The list of equipment MEL

that the FAA requires be aboard and working on

an aircraft before flying.

MicroElectroMechanical.Systems MEMS

Medium Earth Orbit MEO

Main.Engine.Start MES

Meteorology MET

Medium Frequency. The portion of the radio MF

spectrum.from.300.kHz.to.3.MHz.

Multifunction.Control.Display.Panel MFCP

Multifunction.Display MFD

Multifunction.Display.System MFDS

Multifunction.Display.Unit MFDU

Mixed.Fleet.Flying MFF

Mean.Fault.Isolation.Time MFIT

Maintenance.Fault.Memory MFM

Media.File.Server MFS

MLS.Glidepath:.A.ground.based.radio.that. MGP

provides.vertical.guidance.during.an.MLS.landing.

Main.Gear.Steering.Control.Unit MGSCU

Magnetic.Hard.Drive MHD

Megahertz.(1,000,000.cycles.per.second) MHz

Management.Information.Base MIB

Management.Information.Base.II MIB II

Microphone..Also.refers.to.the.output.signal.of.the. MIC

microphone.

_0

Micro.En.route.Automated.Radar.Tracking. MicroEARTS

System

Manufacturing Inspection District Office MIDO

Multipurpose.Interactive.Display.Unit MIDU

Military MIL

General Prediction of Electronic Equipment MIL-HDBK-___

(MTBF)

Military Specifications MILSPEC

System Safety Requirements MIL-STD-___

(.1.).Minimum.. Min

(.2.).Minutes

Million.Instructions.Per.Second MIPS

Most Important Requirement MIR

Multi-function.KeyPad MKP

(.1.).Marker.. MKR

(.2.).Marker.Beacon

Maneuver.Limited.Altitude MLA

Microwave.Landing.System:.An.ILS.like.system. MLS

that.potentially.provides.curved.lateral.path.

selectable.angle.approach.

Maximum.Landing.Weight MLW

(.1.).Mass.Memory.. MM

(.2.).Middle.Marker:.MB.used.in.conjunction.with.

ILS,.intercepts.glideslope.approximately.200.feet.

above.touchdown.

(.1.).Modular.Mounting.Enclosure.. MME

( 2 ) Moving Map Equipment

Master Minimum Equipment List MMEL

Man-Machine.Interface MMI

Monolithic.Microwave.Integrated.Circuit MMIC

The.maximum.Mach.number.at.which.an.aircraft. Mmo has been certified to operate.

Mach Maximum Overspeed MMO

Multi-Mode.Landing.System.Receiver MMR

__

Maintenance.Management.System MMS

Millimeter.Wave MMW

Magnetic.North MN

Network.Management.Category.Interaction. MNCID

Diagram

Minimum Navigation Performance Specification MNPS

Magneto-Optical MO

(.1.).Memorandum.of.Agreement. MOA ( 2 ) Military Operation Area

Minimum Obstruction Clearance Altitude MOCA

( 1 ) Magneto-Optical Drive . MOD

( 2 ) Modification.

(.3.).Modulator

The pulse format for an identification code Mode A

interrogation.of.an.ATC.RBS.transponder.

An.optional.mode.for.transponder.interrogation. Mode B

The.pulse.format.for.an.altitude.information. Mode C

interrogation.of.an.ATC.RBS.transponder.

An.unassigned,.optional.transponder.mode. Mode D

(.1.).Mode.Select.(a.transponder.format.to.allow. Mode S

discrete.interrogation.and.data.link.capability).

(.2.).Selective.interrogation.mode.of.SSR

Modulator/De.modulator MODEM

Monitor Mon

Minimum Operational Performance Requirements MOPR

Minimum Operational Performance Specifications MOPS

Minimum Off-Route Altitude MORA

Metal Oxide Semiconductor MOS

Metal Oxide Semiconductor Field Effect MOSFET

Transmitter

Memorandum Of Understanding MOU

(.1.).Main.Processor.. MP

( 2 ) Middle Plug. Identifies the plug position on

the.rear.connector.of.an.avionics.unit.

__

Multiport.Protocol.Converter.Unit MPCU

Mobile.Packet.Data.Service MPDS

Maximum.Permissible.Exposure.Level MPEL

Multifunction.Process.Unit MPU

Minimum.Reception.Altitude MRA

Maintenance.Review.Board MRB

Multichannel.Receiver/Decoder.Unit MRDU

Maintenance, Repair & Overhaul MRO

Multiple-tasking Real-time Operating System MROSE

Executive

Manufacturing Revision Request MRR

Mean.Response.Time MRT

Millisecond MS

Meter.per.Second m/s

Ministry.of.Transportation.Satellite.Augmentation. MSAS

System.(Japan)

Most Significant Bit MSB

( 1 ) Message Sequence Chart . MSC

(.2.).Member.Services.Center

Mobile.Satellite.Service.Provider MSCP

(.1.).Mass.Storage.Device.. MSD

( 2 ) Most Significant Digit

Message MSG

Medium.Scale.Integration MSI

Minimum.Shift.Keying MSK

Mean.Sea.Level MSL

Mode.Select.Panel MSP

Mobile-Subnetwork.Dependent.Convergence M-SNDCF

Mode S Specific Protocol MSP

Monopulse.Secondary.Surveillance.Radar MSSR

Mode S Specific Services MSSS

_3

(.1.).Mode.Select.Unit.. MSU

(.2.).Magnetic.Sensor.Unit

Minimum.Time MT

Mean.Time.Between.Failures..A.performance. MTBF

figure calculated by dividing the total unit flying

hours.(airborne).accrued.in.a.period.of.time.by.

the.number.of.unit.failures.that.occurred.during.

the.same.time..Where.total.unit.hours.are.

available,.this.may.be.used.in.lieu.of.total.unit. flying hours.

Mean Time Between Outages MTBO

(.1.).Mean.Time.Between.Removal.. MTBR

(.2.).Mean.Time.Between.Repairs..A.performance.

figure calculated by dividing the total unit flying

hours.accrued.in.a.period.by.the.number.of.unit.

removals.(scheduled.plus.unscheduled).that.

occurred.during.the.same.period.

(.1.).Mean.Time.Between.Unscheduled.Removal.. MTBUR

(.2.).Mean.Time.Between.Unit.Replacements..A. performance figure calculated by dividing the total

unit flying hours (airborne) accrued in a period

by.the.number.of.unscheduled.unit.removals.that.

occurred.during.the.same.period.

Maintenance.Terminal.Cabinet MTC

Maintenance.Terminal.Display MTD

Maintenance.Terminal.Function MTF

Moving.Target.Indicator..This.type.of.radar.display. MTI

will.show.only.moving.targets.

Module.Test.and.Maintenance MTM

Module.Test.and.Maintenance.Bus.Interface.Unit MTMIU

Multi-function.Transport.Satellite.System.(Japan) MTSAT

Mean.Time.To.Dispatch.Alert MTTDA

_4

Mean Time To Failure. A performance figure MTTF

calculated.by.dividing.the.summation.of.times.to.

failure.for.a.sample.of.failed.items.by.the.number.

of.failed.items.in.the.sample..The.same.item.

failing.N.times.constitutes.N.failed.items.in.the.

sample..This.is.different.from.mean.time.between.

failures.since.no.allowance.is.given.to.items.that.

have.not.failed.

Mean.Time.To.Maintenance..The.arithmetic.mean. MTTM

of.the.time.intervals.between.maintenance.act.

ions.

Mean.Time.to.Maintenance.Alert MTTMA

Mean Time To Repair. A performance figure MTTR

calculated.by.dividing.the.sum.of.the.active.repair.

elapsed.times.accrued.in.a.period.on.a.number.

of.designated.items.by.the.number.of.these.items.

repaired.in.the.same.period.

Mean.Time.To.Restore.Service MTTRS

Mean.Time.To.Unscheduled.Removal..A. MTTUR

performance figure calculated by dividing the

summation.of.times.to.unscheduled.removal.for.

a.sample.of.removed.items.by.the.number.of.

removed.items.in.the.sample..This.is.different.

from.MTBUR.since.no.allowance.is.given.to.items.

that.have.not.been.removed.

ACARS.Management.Unit MU

Multiplier MULT

Minimum Use Specification. A generic description MUS

by.parameter.and.characteristics.of.the.test. equipment and resources required for testing a

unit.or.system.

Multiplexer MUX

Multi-domained,.Vertically.Aligned MVA

Major.World.Air.Route.Area MWARA

Master.Warning/Master.Caution MW/MC

Mid.Wavelength.Infra-Red MWIR

Master.Warning.Light MWL

__

North N

Fan.speed N _

Intermediate.compressor.speed N _

High.compressor.speed N 3

Not.Applicable N/A

National.Advisory.Committee.for.Aeronautics NACA

National.Airspace.Data.Interchange.Network NADIN

Negative.Acknowledgement NAK

(.1.).National.Aircraft.Standard. NAS

(.2.).National.Airspace.System

National.Aeronautics.and.Space.Administration NASA

NAS.Precision.Approach.and.Landing.System NASPALS

North.Atlantic.Tracks NAT

National.Air.Transport.Association,.Inc. NATA

National Air Traffic Controllers Association NATCA

(.1.).North.Atlantic.Track.System. NATS

(.2.).North.American.Telephone.System

North Atlantic/North American/Pacific NAT/NAM/PAC

Navigation NAV

Navigational Aid. A radio station (VOR) or a NAVAID

waypoint.that.assists.in.navigation.

A.medium.holding.the.customized.navigation. Navigation

database. Datacard

The.NAVSTAR.global.positioning.system.(GPS).is. NAVSTAR

a.system.using.24.satellites,.all.reporting.precise.

time.signals,.along.with.location.keys..Eight.

satellites.are.in.each.of.three.63-degree.inclined.

plane.circular.orbits.at.11,000.nmi.in.altitude..The.

system.is.used.for.navigation.and.determining.

exact.position.

Equivalent to 6,076.1 feet, or approximately . Nautical Mile

1.15.statute.miles. (nmi)

National.Business.Aviation.Association NBAA

Numerical.Control NC

New.Installation.Concept NIC

_6

No.Computed.Data NCD

Not.Currently.Implemented NCI

Network.Coordination.Station NCS

Navigation.Display..An.EFIS.presentation. ND

substituting.for.the.horizontal.situation.indicator.

(HSI).

(.1.).Navigation.Data.Base.(as.stored.in.FMC. NDB

memory)..

(.2.).Non-Directional.Radio.Beacon..A.ground. station designed specifically for ADF use that

operates.in.the.190-.to.550-kHz.range..Transmits.

a.continuous.carrier.with.either.400-.or.1020-Hz. modulation (keyed) to provide identification.

Non-Developmental.Item NDI

Network.Element NE

North.European.ADS-B.Network NEAN

Negative NEG

National.Electrical.Manufacturers.Association NEMA

National.Environmental.Satellite,.Data.and. NESDIS

Information.Service

Network.Entity.Title NET

Next.Generation.Communications NEXCOM

Next.Generation.Radar NEXRAD

No.Faults.Found NFF

New Generation Air Traffic Manager NGATM

High.Pressure.Gas.Generator.RPM NH

Notes.and.Helps.Editor NHE

NAT.Implementation.Management.Group.Cost. NICE

Effectiveness

NAS.Infrastructure.Management.System NIMS

Network.Interface.Processor NIP

Network.Interface.Router NIR

Network.interface.Router.VDL NIRV

Not-In-Service NIS

__

National.Institute.of.Standards.and.Technology NIST

N.is.set.for.any.layer.name.(such.as.link,.network,. N-Layer

etc.).or.for.the.initial.(e..g..N-SDU.means.LSDU. at the link layer). OSI model definition.

Low-Pressure.Gas.Generator.RPM NL

Network-Loadable.Module NLM

Network.Layer.Protocol NLP

Netherlands.National.Aerospace.Laboratory NLR

Not.Less.Than NLT

Nautical.Mile NM or NMI

Network.Management NM

National.Meteorological.Center NMC

Network.Management.Category.Class.Diagram NMCCD

Network.management.Category.Diagram NMCD

Network.Management.Function NMF

Network Management Interface Requirements NMIRS Specification

N-type Metal Oxide Semiconductor NMOS

Network.Management.Plan NMP

Network.Management.System NMS

Not.More.Than NMT

“N”s.are.used.to.represent.a.generic.number.. NNN

Typically, multiple Ns represent a frequency.

National Oceanic and Atmospheric Administration NOAA

Notice Of Change NOC

North Atlantic Oceanic Concept and NOCAR

Requirements

National Operations Control Center NOCC

No Communication. A NO COM annunciation NO COM

indicates.that.a.downlink.message.has.not.been.

acknowledged.in.an.ACARS.system.

Notice of Inquiry NOI

__

Undesired.random.electromagnetic.disturbances. Noise

or.spurious.signals.that.are.not.part.of.the.

transmitted.or.received.signal.

Notification of Problem NOP

North Pacific NOPAC

Notice.to.Airmen NOTAM

Notice.to.Users.(ARINC) NOTUS

Non-Precision.Approach NPA

Network.Protocol.Data.Unit NPDU

Notice.of.Proposed.Rule.Making NPRM

Network.Router NR

Network.Routing.Domain NRD

National.Route.Program NRP

Non-Return.to.Zero NRZ

Network.Service NS

Network.Service.Access.Point NSAP

Network.Service.Data.Unit NSDU

Neutron.Single.Event.Upset NSEU

National.Severe.Storms.Laboratory NSSL

No.Trouble.Found..(Referring.to.testing.or. NTF

checkout.of.unit/module.)

National.Telecommunications.and.Information. NTIA

Administration.(U.S.)

National.Transportation.Safety.Board NTSB

Network User Identification NUI

Night.Vision.Goggles NVG

Non-Volatile.Memory NVM

Non-Volatile.RAM NVRAM

National.Weather.Service..The.NWS.provides. NWS

a.ground-based.weather.radar.network.

throughout.the.United.States..The.radar.network.

operates.continuously.and.transmits.the.data.

to.the.National.Meteorological.Center,.where.it.

correlates.with.other.weather.observations.

_9

Oceanic Area Control Center OAC

Official Airline Guide OAG

Oceanic Automation System OAS

( 1 ) Operational Acceptance Test . OAT

( 2 ) Optional Auxiliary Terminal. The OAT may be

in.the.form.of.a.CRT/Keyboard.device.capable.

of.interfacing.with.other.sources.of.data.on.the.

aircraft.and.supplying.data.to.a.hard.copy.printer..

(Used.in.an.ACARS.system.)..

( 3 ) Outside Air Temperature. The uncorrected

reading.of.the.outside.temperature.gauge..

Different types of gauges require different correct

ion.factors.to.obtain.static.air.temperature.

Orbit and Attitude Tracking OATS

Operational Build Plan OBP

( 1 ) Omnibearing Selector. A panel instrument OBS

that.contains.the.controls.and.circuits.to.select. an omnibearing and determine the TO-FROM

indication... ( 2 ) Optical Bypass Switch

Oceanic Control Area OCA

Operations Control Center OCC

Oceanic Clearance Delivery OCD

Oceanic Communications Improvement Group OCIG

Oceanic CLearance OCL

Options Configuration Module OCM

Oceanic Clearance Processor OCP

Base-8.counting.system..Numbers.include.0,.1,.2,. Octal

3,.4,.5,.6,.7.

Oceanic Display And Planning System. Will ODAPS

present oceanic flight data to controllers in a

display.that.will.enable.better.route.and.altitude.

assignments.

Organizational Designated Airworthiness ODAR

Representative

Operational Display and Input Development ODID

_0

( 1 ) Optical Data Link . ODL

( 2 ) Oceanic Data Link

Open Data Network ODN

Original Equipment Manufacturer OEM

Overhead Electronics Units OEU

The.time.that.the.aircraft.leaves.the.gate. Off-Block Time

Same.as.cross-side.of.the.cockpit. Off-Side

Operational Flight Program OFP

Offset OFST

Operational Ground Equipment OGE

Overhead Unit (HUD) OHU

Outline Installation Drawing OID

Orientation/Introduction Unit OIU

Onboard Local Area Network OLAN

On-Line Data Interchange OLDI

Operating and Maintenance O&M

Outer Marker Beacon: MB used in conjunction OM

with.ILS,.intercepts.glideslope.approximately.

1400.feet.above.touchdown.

Onboard Maintenance Documentation OMD

A.navigation.system.that.uses.two.high-powered. OMEGA

transmitter.ground.stations.to.broadcast.a.

continuous.wave.signal..The.receiver.measures.

the.range.difference.between.the.two.stations.to.

determine.position.

The.bearing.indicated.by.a.navigational.receiver. Omnibearing

on.transmissions.from.an.omnidirectional.radio.

range (VOR).

( 1 ) Onboard Maintenance System. OMS

( 2 ) Order Management System

Object Modeling Technique OMT

Refers.to.a.pilot.or.copilot’s.own.side.of.the. ON-SIDE

cockpit.

Object Oriented Analysis OOA

__

Object Oriented Design OOD

OUT-OFF-ON-IN. An OOOI event is recorded as OOOI

part of the ACARS operation. The OUT event is

recorded.when.the.aircraft.is.clear.of.the.gate.and. ready to taxi. The OFF event occurs when the

aircraft has lifted off the runway. The ON event

occurs.when.the.aircraft.has.landed..The.IN.event.

occurs.when.the.aircraft.has.taxied.to.the.ramp.

area.

The.time.that.the.aircraft.arrives.at.the.gate. On-Block Time

Operational OP

Operational Program Configuration OPC

Optimum OPT

Overhead Panel ARINC 629 System OPAS

Overhead Panel Bus Controller OPBC

Operational Program Configuration OPC

Operation OPER

Once Per Revolution OPR

( 1 ) Operations Per Second . OPS

( 2 ) Operational Program Software

Operational Specifications OPSPECS

Overspeed Protection Unit OPU

Optical Quick Access Recorder O-QAR

Operational Requirements OR

Origin ORIG

Owner’s Requirement Table ORT

Operating System OS

Order Status Report OSC

Oceanic System Development Support OSDS

( 1 ) Open Systems Interconnection . OSI

( 2 ) Open System Interface

OSI Environment OSIE

Open Systems Interconnection Reference Model OSI-RM

Open Shortest Path First OSPF

__

Operational Test and Evaluation OT&E

Office of Technology Assessment (U.S.) OTA

Operational Traffic Flow Planning OTFP

Over The Horizon OTH

Office of Telecommunications Policy (U.S.) OTP

Off-The-Shelf OTS

Override OVRD

Overhead Video System OVS

Oxygen oxy

(.1.).Passenger.Address.. PA

( 2 ) Power Amplifier

Path.Attenuation.Compensation.(Correction):.A. PAC

warning.annunciation.of.the.weather.radar..It.tells.

the pilot there is a significant weather activity on

that.bearing.

Passenger.Address/Cabin.Interphone PA/CI

Passenger.Address.and.Communication. PACIS

Interphone.System

Packet.Assembler-Disassembler PAD

DME channels are paired with a VORTAC or ILS Paired

frequency and are automatically selected when Channels

the VORTAC or ILS frequency is selected. Most

navigation.controls.have.this.feature.

Programmable.Array.Logic PAL

Pulse.Amplitude.Modulation PAM

Pressure,.ambient PAMB

Procedures.for.Air.Navigation.Services-Aircraft. PANS-OPS

Operations

Precision.Approach.Path.Indicators PAPI

Precision.Approach.Radar..An.X-band.radar.that. PAR

scans.a.limited.area.and.is.part.of.the.ground-

controlled.approach.system.

Passenger.Address.System PAS

(.1.).Pilot.Applications.Terminal.. PAT

(.2.).Primary.Access.Terminal

_3

Passenger.Address.Unit PAU

Presence.And.Validity PAV

Programmable.Audio.Video.Entertainment. PAVES

System

Performance.Assessment.and.Workload. PAWES

Evaluation

Passenger PAX

Push.Button.Annunciator PBA

Place.Bearing/Distance.(waypoint) PBD

Post.Burn-In.Data PBID

Private.Branch.Exchange PBX

(.1.).Personal.Computer.. PC

(.2.).Printed.Circuit

The.GPS.precision.code P-Code

P physical Configuration Audit PCA

Printed.Circuit.Board PCB

Pilot.Controller.Communication PCC

(.1.).Protocol.Control.Information..The.N-PCI.is. PCI

exchanged between peer network members (OSI

Model).to.coordinate.joint.information...

(.2.).Peripheral.Computer.Interface/Interconnect

Precipitation PCIP

Pulse.Code.Modulation PCM

Personal.Computer.Memory.Card.Interface. PCMCIA

Association

(.1.).Passenger.Control.Unit.. PCU

(.2.).Power.Control.Unit

Profile Descent PD

Premature.Descent.Alert PDA

Performance.Data.Base PDB

Pre-Departure.Clearance PDC

Panel.Data.Concentrator.Unit PDCU

Package.Design.Document PDD

_4

Product Definition Data Interface. Standardizes PDDI

digital descriptions of part configurations and

properties.needed.for.manufacturing.

(.1.).Primary.Display.Function.. PDF

(.2.).Portable.Document.Format

(.1.).Program.Design.Language.. PDL

(.2.).Portable.Data.Loader

Precision Distance Measuring Equipment P-DME

Public.Data.Network.(CC.ITT/ISD) PDN

Position Dilution Of Precision. AGPS term for PDOP

error.introduced.into.the.GPS.calculations.

Powered Door Opening System PDOS

Preliminary.Design.Review PDR

Primary.Display.System PDS

(.1.).Power.Distribution.Unit.. PDU

(.2.).Power.Drive.Unit..

(.3.).Protocol.Data.Unit..The.N-PDU.is.a.

combination.of.the.N-PCI.and.the.N-UD.or..

N-SDU..The.N-PDU.is.the.total.information.that.is. transferred between peer network members (OSI

Model).as.a.unit..

(.4.).Pilot.Display.Unit

Peer.Entity.Contact.Table PECT

Peak.Envelope.Power PEP

Performance PERF

A.relative.number.used.to.compare.the. Performance

performance.of.different.radar.systems..It.is. Index

calculated.from.transmitter.peak.power,.antenna.

gain,.pulse.width,.prf,.antenna.beam.width.and. the receiver noise figure.

Program Evaluation Review Technique PERT

Passenger.Entertainment.System PES

Pacific Engineering Trials PET

Preliminary.Eurocontrol.Test.of.Air/Ground.Data. PETAL

Link

__

Preliminary.Eurocontrol.Test.of.Air/Ground.Data. PETAL II

Link,.Phase.II

Preliminary.Eurocontrol.Test.of.Air/Ground.Data. PETAL IIe

Link,.Phase.II.Extension

(.1.).Pilot.Flying.. PF

(.2.).Power.Factor

Primary.Flight.Computer PFC

Primary.Flight.Control.System PFCS

(.1.).Primary.Flight.Director.. PFD

(.2.).Primary.Flight.Display..An.EFIS.presentation.

substituting.for.the.ADI.

Passenger.Flight.Information.System PFIS

Primary Field Of View PFOV

Pulse Repetition Frequency. The rate at which PFR

pulses.are.transmitted.

Product.File.Sets PFS

Pin.Grid.Array PGA

Program.for.Harmonized.ATC.Research.in. PHARE

Europe

Performance.Buffet.Limit PHIBUF

Nominal.Bank.Angle PHINOM

Physical.Interface.Device PHY

A.signal.in.which.the.phase.varies.(with.respect. Phase

to.the.original.signal).with.the.amplitude.of.the. Modulation

modulatory.signal,.while.the.amplitude.of.the.

carrier.wave.remains.constant..Similar.to.a.

modified frequency modulated signal.

Parameter Identifier PI

Performance.Integrity.and.Availability PIA

Protocol.Implementation.Conformance. PICS

Statements

( 1 ) Parameter Identifier . PID

( 2 ) Primitive Identifier .

( 3 ) Process Identifier

Processor Input/Output PI/O

_6

Production.or.Pipe.Internal.Roll.Extrusion PIRE

Pilot.Reports PIREPS

The.sum.of.the.static.and.dynamic.pressures.and. Pitot Pressure

is.the.total.force.per.unit.area.exerted.by.the.air.

on.the.surface.of.a.body.in.motion.

A.forward.facing.probe.attached.to.the.outside.of. Pitot Tube

the.aircraft.to.sense.the.relative.pressure.of.the.

aircraft.moving.through.the.atmosphere..Named.

for Henri Pitot who first used this method of

measuring fluid flow pressure.

Parameter.Length PL

(.1.).Power.Level.Angle.. PLA

(.2.).Programmable.Logic.Array

Precision.Lightweight.GPS.Receiver PLGR

Phase.Locked.Loop PLL

Project.Leadership.Team PLT

Phase.Modulation PM

(.1.).Parts.Manufacturing.Approval.. PMA

(.2.).Permanent.Magnet.Alternator

Portable.Maintenance.Access.Terminal PMAT

(.1.).Provisional.Memory.Cover.. PMC

(.2.).PCI.Mezzanine.Card

Processor/Mass Storage Equipment PME

Permanent.Magnet.Generator PMG

Program Management Office PMO

P-Type Metal Oxide Semiconductor PMOS

Precision.Multi-mode.Radar PMR

Program.Management.Reviews PMRs

Performance.Management.System PMS

(.1.).Part.Number.. PN

(.2.).Pseudo.Noise

Performance.Navigation.Computer.System PNCS

Primary.Navigation.Display PND

Pneumatic PNEU

__

Pilot.Not.Flying PNF

Point.of.No.Return PNR

Plain Old ACARS POA

Proof Of Concept. A Demonstration, in a full POC

operational.environment,.of.the.proposed.

concept,.system,.facilities,.weather.conditions,.

crew.complement,.related.aircraft.systems.and.

any.other.relevant.parameters.necessary.to.show.

concept.validity..Acceptable.performance,.system.

reliability,.repeatability,.and.typical.pilot.response.

to.failures.must.be.successfully.demonstrated..

The demonstration itself is not a certification

program.

Principal Operations Inspector POI

Point.of.Presence POP

Pacific Ocean Region POR

Position POS

Position.Initialization POSINIT

Portable Operating System Interface POSIX

Position.Reference POSREF

Potentiometer POT

Power-On Self-Test POST

Plain Old Telephone System/Service POTS

Product/Process.Assurance.Plan P/PAP

Power.PC PPC

Physical.Layer.Protocol.Data.Unit PPDU

Planned.Position.Indicator..A.type.of.radar.display. PPI

which.shows.aircraft.positions.and.airways.chart.

on.the.same.display.

Processor-to-Processor.Link PPL

pages.per.minute ppm

(.1.).Pulse.Position.Modulation.. PPM

(.2.).Parts.Per.Million

Present.Position PPOS

Point-to-Point.Protocol PPP

__

(.1.).Packets.Per.Second. PPS

(.2.).Precise.Positioning.Service.

(.3.).Pulse.Per.Second

Problem.Report PR

Predictive.Receiver.Autonomous.Integrity. PRAIM

Monitoring

Prerecorded.Announcement.Machine PRAM

Preliminary.Data PRELIM

Pressure PRESS

The.altitude.measured.above.standard.pressure. Pressure

level..Based.on.the.relationship.of.pressure.and. Altitude

altitude.with.respect.to.a.standard.atmosphere.

Previous PREV

A.resolution.advisory.that.instructs.the.pilot.to. Preventive

avoid.certain.deviations.from.current.vertical.rate.. Advisory

(TCAS)

Pulse Repetition Frequency PRF

(.1.).Primary.. PRI

(.2.).Primary.Rate.Interface

A means of navigation which satisfies the Primary Means

necessary.levels.of.accuracy.and.integrity.for.a. of Navigation

particular.area,.route,.procedure.or.operation..

The.failure.of.a.“Primary.Means”.of.navigation.

may result in, or require reversion to a “non-

normal”.means.of.navigation,.or.an.alternate.

level of RNP. Qualification as a “primary means”

of navigation typically requires that ANP/EPU be

less.than.RNP.for.99.99%.of.the.time.

(.1.).Precision.Runway.Monitoring. PRM

(.2.).Proposed.Rule.Making

Pseudo.Random.Noise PRN

NND-1/Precision.Area.Navigation PRNAV

Procedure PROC

Profile PROF

Progress.Page.on.MCDU PROG

Programmable ROM PROM

_9

NND-1/Precision.Area.Navigation P-RNAV

A.set.of.rules.for.the.format.and.content.of. Protocol

messages.between.communicating.processes.

Provisional PROV

Proximity PROX

Pressure.Regulating.and.Shutoff.Valve PRSOV

Press.To.Reset P/RST

Printer PRTR

Power.Supply PS

(.1.).Power.Supply.Assembly.. PSA

(.2.).Preselect.Altitude

Product.Support.&.Assurance.Agreement PSAA

Primary.Stability.Augmentation.System PSAS

Project Specific Certification Plans PSCP

Programmable.System.Control.Unit PSCU

Port.Sharing.Device PSD

Packet.Switched.Data.Network PSDN

Power Supply Equipment PSE

Proximity.Sensor.Electronic.Unit PSEU

Pounds per square inch Differential PSID

Pounds per square inch Gage PSIG

Problem.Statement.Language/Problem.Statement. PSL/PSA

Analyzer

(.1.).Power.Supply.Modules.. PSM

(.2.).Product.Support.Managers

Packet.Switching.Network PSN

Partnership.for.Safety.Plan PSP

Preferred.Standard.Parts.List PSPL

Primary.Surveillance.Radar..The.part.of.the.ATC. PSR

system.that.determines.the.range.and.azimuth.of.

an.aircraft.in.a.controlled.air.space.

Proximity.Sensor.System PSS

Preliminary.System.Safety.Assessment PSSA

90

Passenger.Service.Unit PSU

Total.Pressure PT

Production Test Requirements PTR

Pitch:.Movement.about.the.lateral.(left.to.right). PTCH

axis.of.the.aircraft.

Performance.Test.Domain PTD

Packet.Switching.Exchange PSE

Public.Switched.Telephone.Network PSTN

Path PTH

Packet Type Identifier PTI

Peripheral Transition Module (I/O interface for PTM

SBC)

Production Test Requirements PTR

Problem.Tracking.System PTS

Production Test Specification Document PTSD

(.1.).Post,.Telephone.and.Telegraph.. PTT

(.2.).Push.To.Talk..Also.refers.to.the.switching.

signal.that.enables.the.transmitter...

(.3.).Push.To.Test

Power.Transfer.Unit PTU

Plan.View.Display PVD

Parameter.Value PV

Permanent.Virtual.Circuit PVC

Position,.Velocity,.Time PVT

Printed.Wire.Boards PWB

Pulse-Width.Modulation PWM

Power PWR

Predictive.Windshear.System PWS

Quadrature.Amplitude.Modulation QAM

Quick.Access.Recorder QAR

Quality.Control QC

Quadrantal.Error.Corrector QEC

9_

A.method.of.setting.the.altimeter.to.compensate. QFE

for.changes.in.barometric.pressure.and.runway.

elevation. Pilot receives information from airfield

and.adjusts.his.altimeter.accordingly.and.it.will.

read.zero.altitude.at.touchdown.on.the.runway.

Quality.Management QM

Quality.Management.Plan QMP

The.method.of.setting.the.altimeter.to.the. QNE

standard.atmosphere.datum-29.92.inches.of.

mercury.(1,013.25.mb)..This.setting.is.used.in..

the.United.States.airspace.by.all.aircraft.above..

FL.180.

The.more.common.method.of.setting.the.altimeter. QNH

to.compensate.for.changes.in.barometric.

pressure. Pilot receives information from airfield,

adjusts.his.altimeter.accordingly.and.the.altimeter.

will read airfield elevation at touchdown.

Quality Operating Procedures QOP

Quality.of.Service QoS

Quick.Reference.Handbook QRH

Quantity QTY

Quadrant QUAD

Error.in.the.relative.bearing.caused.by.the. Quadrantal

distortion of the received radio signal (RF fields) Error

by.the.structure.of.the.aircraft.

(.1.).Right.. R

(.2.).Route.Tuned.NAVAID..

(.3.).Rudder

(.1.).Resolution.Advisory.(generated.by.TCAS).. RA

(.2.).Radio.Altimeter..

(.3.).Routing.Area..

(.4.).Radio.Altitude:.The.absolute.altitude.(height).

above.the.ground..Measured.by.a.radio.altimeter.

system.

Regional.Airline.Association RAA

9_

Rabbit.Tracks,.or.running.rabbits,.refer.to.the. Rabbit Tracks

distinctive.display.produced.by.another.(alien.

radar).radar.system.transmission.

(.1.).Radial.. RAD

(.2.).Radio..

(.3.).Rapid.Application.Development

Radio.Detecting.and.Ranging..A.system.that. Radar

measures.distance.and.bearing.to.an.object.

The.time.interval.(approximately.12.359. Radar Mile

microseconds) required for radio waves to travel

one.nautical.mile.and.return.(total.of.2.nmi).

A line of direction going out from a VOR station Radial

measured.as.a.bearing.with.respect.to.magnetic.

north.

Regional.Airworthiness.Engineer.(Canadian) RAE

The.radome.is.the.protective.cover.on.the.aircraft. Radome nose that fits over the weather radar system

antenna..The.radome.is.transparent.at.radar. frequencies.

Requirements Analysis Folder RAF

Radio.Altimeter.Indicator RAI

Receiver.Autonomous.Integrity.Monitoring RAIM

Radio.Altimeter.(also.RA,.RA.DA.LT,.LRA,.LRRA) RALT

Random.Access.Memory..Generally.used.to. RAM

describe.read/write.integrated.circuit.memory.

Remote.Area.Precision.Positioning.System RAPPS

(.1.).Row.Address.Strobe.. RAS

(.2.).Reference.Approach.Speed

Required Communication Performance RCP

RAM.Air.Temperature.is.the.temperature.of.the.air. RAT

entering.an.air.scoop.inlet..It.is.a.factor.in.engine.

performance.

Rockwell.Collins RC

Rate.of.Climb R/C

Resistor-Capacitor.network R-C

93

Rack.Connectors.and.Wiring R-C&W

Remote.Center.Air/Ground.Station RCAG

Remote.Charge.Converter RCC

Radio Control Equipment RCE

Rockwell.Collins.Flight.Dynamics RCFD

(.1.).Radio.Communications.Link.. RCL

(.2.).Recall

Remote Communications Outlet RCO

Rockwell.Collins.Management.Authorization. RC-MAP

Process

(.1.).Radio.Control.Panel. RCP

( 2 ) Required Communications Performance

Routing.and.Circuit.Restoral RCR

Rockwell.Collins.Technical.Consistent.Process RC-TCP

Remote.Control.Unit RCU

Receiver RCVR

Research.and.Development R&D

R-Channel.used.for.data Rd

Regional.Domestic.Air.Route.Area RDARA

(.1.).Routing.Domain.Confederation.. RDC

(.2.).Remote.Data.Concentrator

Routing.Domain.Format RDF

Routing Domain Identifier RDI

Radio.Distance.Magnetic.Indicator RDMI

Radar.Data.Processing.(system) RDP

Radar RDR

Radio.Determination.Satellite.Service RDSS

(.1.).Receiver/Decoder.Unit.. RDU

(.2.).Remote.Display.Unit

Requirements Development and Validation RDV

Rapid.Deployment.Voice.Switch RDVS

Reliability.Evaluation.and.Corrective.Action. RECAP

Program

94

Reference REF

Reflection REFL

This.is.a.measurement.of.the.ability.of.a.target.to. Reflectivity

reflect the energy from a radar beam. Factor (Z)

The.bearing.of.a.ground.station.relative.to.the. Relative

direct.ion.the.aircraft.nose.points,.or.the.direction. Bearing

of.an.aircraft.to.or.from.an.NDB.

Relative REL

A.probability.of.occurrence.greater.than.1.x.10^- Remote

7 but less than or equal to 1 x 10^-5 per hour of

flight, or per event (e.g. takeoff, landing)

Reliability.Enhancement.Program REP

( 1 ) Request . REQ

( 2 ) Required/Requirement

Residual.Error.Rate RER

A.display.indication.given.to.the.pilot. Resolution

recommending.a.maneuver.to.increase.vertical. Advisory

separation.relative.to.an.intruding.aircraft..A. resolution advisory is also classified as corrective

or.preventive.

Restriction RESTR

Resynchronizing RESYNCING

(.1.).Rapid.Exit.Taxiway.. RET

(.2.).Reliability.Evaluation.Test

Remote.Electronics.Unit REU

Radio Frequency. A general term for the range of RF

frequencies above 150 kHz, to the infrared region

(1012.Hz).

Request for Comments RFC

Reconfigurable Flight Deck RFD

( 1 ) Radio Frequency Interference . RFI

( 2 ) Request For Information

Request For Proposal RFP

Requirements Functional allocation Synthesis RFSIVV

Integration Verification Validation

9_

Request For Technical Proposal RFTP

Radio Frequency Unit RFU

Red/Green/Blue RGB

Review.of.the.General.Concept.of.Separation. RGCSP

Panel

Radio.Handler RH

Range.and.Height.Indicator RHI

Response.on.Handoff RHO

Reduced.Horizontal.Separation.Minima RHSM

(.1.).Right.Inboard.. RIB

(.2.).Routing.Information.Base

Routing.Information.Protocol RIP

Recorder.Independent.Power.Supply RIPS

Reduced.Instruction.Set.Computer RISC

Radio.Interface.Unit RIU

Regional.Jet RJ

Red.Label R/L

Radio.Altitude RA

Rijksluchtvaartdienst.(The.Netherlands’.Civil. RLD

Aviation.Agency)

Response.on.Link.Establishment RLE

Ring.Laser.Gyros RLG

Relative.Location.Indicator RLI

Ring.Laser.Gyro RLP

(.1.).Reliable.Link.Source.. RLS

(.2.).Remote.Light.Sensor

Relay RLY

Reliability.and.Maintainability R&M

Reliability.Maintainability.and.Availability RM&A

Remote.Maintenance.Access. RMA

Radio.Magnetic.Indicator RMI

RM.Management.System RMMS

96

(.1.).Radio.Management.Panel. RMP

(.2.).Remote.Maintenance.Panel

Remote RMT

Area.Navigation R-NAV

Range RNG

Range.Arc RNGA

Required Navigation Performance. A statement RNP

of.the.navigation.performance.necessary.for. operation within a defined airspace.

Receive.Not.Ready RNR

Radio.Nav.Tuning.Panel RNTP

( 1 ) Radio Operator . RO

( 2 ) Roll Out

Recognized Operating Agency ROA

Right Outboard ROB

( 1 ) Rate Of Climb . ROC

( 2 ) Rate of Operational Capability

Rate Of Descent ROD

Roll ROL

Movement.about.the.longitudinal.(front.to.back). ROLL

axis.of.the.aircraft.

Rollout starts from the first contact of the wheels Rollout

with the runway and finishes when the airplane

has.slowed.to.a.safe.taxi.speed.(in.the.order.of.

30.knots).

( 1 ) Read Only Memory . ROM

( 2 ) Rough Order of Magnitude

Remain Over Night RON

Runway Occupancy Time ROT

Relocatable Over-The-Horizon Radar ROTHR

An ordered group of flight reference points ROUTE

(Airports,.Navaids,.Geographic.Reference.Points,. etc.) representing part or all of a planned flight

path.

9_

Routing.Protocol RP

Remote.Power.Distribution.Unit RPDU

Rapid.Process.Improvement RPI

Revolutions.Per.Minute RPM

Recognized Private Operation Agency (CCITT) RPOA

Receiver.Ready RR

Router.Reference.Implementation RRI

Reliable Sequencing Delivery Confirmation RSDP

Protocol

Regional.Subnetwork RSN

( 1 ) Required Surveillance Performance . RSP

(.2.).Reversion.Switch.Panel

Received.Signal.Strength.Indicator RSSI

(.1.).Radio.Telecommunication.. RT

(.2.).Receiver-Transmitter.(R/T)..Also.referred.to.

as.a.transceiver..(See.T/R)

(.1.).Receiver-Transmitter.Antenna.. RTA

( 2 ) Required Time of Arrival

Real-Time.Clock RTC

Radio.Technical.Commission.for.Aeronautics RTCA

RTCA.Document.160,.Environmental.Conditions. RTCADO-_60

and Test Procedures for Airborne Equipment,

Issued.12/04/89

RTCA.Document.178,.Software.Considerations. RTCADO-___

in Airborne Systems and Equipment Certification,

issued.03/22/85

Route RTE

Radio.telephony RTF

Real-Time.Interrogate RTI

Radio.Transmission.Module RTM

Reliability.Test.Plan RTP

Rejected.Takeoff RTO

Real-Time Operating System RTOS

9_

Radio.Tuning.Panel RTP

Remote.Transmitter.Receiver.Site RTR

( 1 ) Request To Send . RTS

(.2.).Real-Time.Studio

Required Total System Performance RTSP

Rotable.Total.Service.Solutions. RTSS

Run-Time Type Identification RTTI

Radio.Tuning.Unit:.A.control.for.tuning. RTU

communication.and.navigation.radios.

Real-Time.Workshop RTW

Rack.Unit RU

The.act.of.inadvertently.crossing.the.runway. Runway

holding.point.without.ATC.clearance. Incursion

Rotary.Voltage.Differential.Transducer RVDT

Runway.Visual.Range RVR

Reduced.Vertical.Separation.Minimum RVSM

Read/Write R/W

Runway RW

Read-Write.Memory..A.memory.in.which.each.cell. RWM

is.selected.by.applying.appropriate.electrical.input.

signals,.and.the.stored.data.may.be.either.sensed.

at.the.appropriate.output.terminal.or.changes.in.

response.to.other.electrical.input.signals.

Reactive.Windshear.System RWS

Runway RWY

Receiver Rx

Return.to.Zero RZ

South S

Segment.0 S0

Segment.1 S_

(.1.).Selective.Availability.. SA

(.2.).Situation.Awareness

Service.Access.Area.(VHF.Cat.B.ACARS) SAA

99

Special Aircraft/Aircrew Authorization Required SAAAR

Secondary.Attitude.Air.Data.Reference.Unit SAARU

Society.of.Aeronautical.Engineers SAE

System.Architecture.and.Interface SAI

System.Address.Label.(ARINC.429) SAL

Small.Aircraft.Manufacturers.Association SAMA

Service.Access.Points SAP

Search.and.Rescue SAR

Standards And Recommended Practices (ICAO) SARPS

(.1.).Stability.Augmentation.System. SAS

(.2.).Station.Address.Set

(.1.).Static.Air.Temperature.is.the.total.air. SAT

temperature.corrected.for.the.Mach.effect..

Increases.in.airspeed.cause.probe.temperature.

to.rise.presenting.erroneous.information..SAT.is.

the.outside.air.temperature.if.the.aircraft.could.be.

brought.to.a.stop.before.measuring.temperatures...

(.2.).System.Acceptance.Test

Satellite.Communications SATCOM

Satellite.Navigation SATNAV

Service.Bulletin SB

Space.Based.Augmentation.System SBAS

Single.Board.Computer SBC

Schematic.Block.Diagram SBD

Single.Bit.Error SBE

Step.Climb S/C

Special.Committee SC

Angle of the weather reflectivity information with SCAN ANGLE

respect.to.the.aircraft.heading.

Special.Category SCAT

Special.Category.1.Approach.System SCAT-_

( 1 ) Specification Control Drawing . SCD

(.2.).System.Category.Diagram

_00

Satellite.Control.Data.Unit SCDU

Servicing.Customers.Engineer SCE

Software Configuration Index Drawing SCID

Radio.Altimeter.Indicator SCIU

Software Configuration Management SCM

Single.Carrier.Per.Channel SCPC

Supply.Chain.Quality.Assurance SCQA

Special Certification Review SCR

Single.Channel.Simplex..A.communication. SCS

system.that.uses.simplex.

Small.Computer.System.Interface SCSI

System Configuration Table SCT

(.1.).Signal.Conditioning.Unit. SCU

(.2.).Signal.Conversion.Unit

(.1.).Side.Display.. SD

(.2.).Storm.Detection..It.is.the.designation.for.

the.hourly.transmitted.radar.observations.from.

the.NWS.and.ARTCC.radars..Individual.SDs.

are.combined.and.transmitted.once.an.hour.as.

collectives.(.SDUs).over.the.aviation.teletype.

circuits.

System.Design.&.Analysis.Harmonization. SD&AHWG

Working.Group

(.1.).Standard.Disk.Drive.. SDD

(.2.).Sensor.Display.Driver.

(.3.).System.Description.Document

Simplified Directional Facility SDF

Source Destination Identifier: A bit field contained SDI

in.serial.data.words.that.tell.the.source.or.

destination.of.the.data.in.that.word.

(.1.).Speaker.Drive.Module. SDM

(.2.).Service.Delivery.Management

Surveillance.Data.Processing SDP

Synchronous.Dynamic.Random.Access.Memory SDRAM

Supplier Data Requirements List SDRL

_0_

(.1.).Satellite.Data.Unit.. SDU

(.2.).Sensor.Display.Unit..

(.3.).Service.Data.Unit

Seat.Electronics.Box SEB

Secondary SEC

Secondary.EICASD.is.play SED

(.1.).Software.Engineering.Institute.. SEI

(.2.).Standby.Engine.Indicator

(.1.).Select.. SEL

( 2 ) Selector Identifier

Selective.Calling.System..A.system.used.in. SELCAL

conjunction.with.HF.and.VHF.communication.

systems.that.allows.a.ground-based.radio.

operator.to.call.a.single.aircraft.or.group.of.aircraft.

without.the.aircraft.personnel.monitoring.the. ground station radio frequency.

Sensor SENS

An instruction given to the TCAS equipment for Sensitivity

control.of.its.threat.volume.. Level

Command

Secondary.Electrical.Power.Contactor SEPC

Stress.Evaluation.Prediction.Program SEPP

Serial.Number SERNO

(.1.).Single.Event.Upset.. SEU

(.2.).Seat.Electronics.Unit

Special.Federal.Aviation.Regulation SFAR

Subsystem.Fault.Detection.Function SFDF

Supplier Furnished Equipment SFE

Signal.Generator SG

Standard.Generalized.Markup.Language. SGML

Surface.Guidance.System SGS

(.1.).Selective.Interrogation.. SI

(.2.).Standby.Instruments..

(.3.).Supporting.Interrogator..

(.4.).Supplementary.Information

_0_

Standard.Instrument.Approach.Procedure SIAP

Secondary.Surveillance.Radar.Improvements.and. SICAS

Collision.Avoidance.System

Secondary.Surveillance.Radar.Improvements. SICASP

And.Collision.Avoidance.System.Panel

Standard.Instrument.Departure SID

The.reproduction.of.sounds.in.a.headset.(or. Sidetone

speaker).from.the.transmitter.of.the.same.

communication.set..This.allows.a.person.to.hear.

his/her.own.voice.when.transmitting.

(.1.).Standard.Interchange.Format.. SIF

(.2.).System.Integration.Facility

Significant Meteorological Observations SIGMETS

(.1.).Systems.Integration.Lab.. SIL

(.2.).Service.Information.Letter

A.communication.operation.that.uses.only. Simplex

a.single.channel.for.transmit.and.receive.

operations..Communications.can.take.place.in.

only.one.direction.at.a.time.

Signal-plus-Noise-plus-Distortion.to.Noise-plus- SINAD

Distortion-Ratio

Single.In-line.Package SIP

Societe.Internationale.de.Telecommunications. SITA

Aeronautiques

System.Integration.Test.Plan/Description SITP/D

System.Integration.and.Test SIT

System.Integration.Test.Report SITR

Satellite.Interface.Unit SIU

Skip SKP

A radio wave that is reflected by the ionosphere. Skywave

Depending.upon.the.state.of.the.ionosphere,.the.

reflected radio wave may propagate along the

layer of the ionosphere or be reflected at some

angle..It.is.also.known.as.ionospheric.or.indirect.

wave.

_03

Sensitivity.Level SL

Sub-Level S/L

Service.Level.Agreement SLA

The.line-of-sight.distance.from.the.aircraft.to.a. Slant Range

DME.ground.station.

Synchronous.Link.Control SLC

System.Level.Health SLH

System.Level.Interface SLI

Standard.Length.Message SLM

Source.Lines.of.Code SLoC

Side-Lobe.Suppression..A.system.that.prevents. SLS

a.transponder.from.replying.to.the.side-lobe.

interrogations.of.the.SSR..Replying.to.side-lobe.

interrogations.would.supply.false.replies.to.the.

ATC.ground.station.and.obscure.the.aircraft.

location.

System.Level.Use.Case SLUC

( 1 ) Service Level Verifier . SLV

(.2.).Sync.Lock.Valve

System.Monitor SM

Surface.Movement.Advisor SMA

System.Management.and.Communication SMC

Surface.Mount.Device SMD

Switched.Multi-megabit.Data.Service SMDS

System.Management.Entity SME

Surface.Movement.Guidance.and.Control. SMGCS

Systems

Standard Message Identifiers SMI

Seamless.Pipe.and.Tube SMLS

Spectrum.Monitoring.System SMS

_04

(.1.).Aileron/Rudder.Servo.Mount.. SMT

(.2.).Elevator.Servo.Mount..

(.3.).Servo.Mount..

(.4.).Stabilizer.Trim.Servo.Mount..

(.5.).Standard.Message.Text..

(.6.).Station.Management..

(.7.).System.Maintenance.Task

Subnetwork SN

System.Network.Architecture SNA

Subnetwork.Access SNAC

Subnetwork.Access.Protocol SNAcP

Subnetwork.Connection.Reference SNCR

Subnetwork.Dependent.Convergence.Function SNDCF

Subnetwork.Dependent.Convergence.Protocol SNDCP

Subnetwork.Independent.Convergence.Function SNICF

Subnetwork.Link.Establishment SNLE

Simple.Network.Management.Protocol SNMP

Subnetwork.Point.of.Attachment SNPA

Subnetwork.Protocol.Data.Unit SNPDU

Signal-to-Noise.Ratio SNR

Subnetwork.Service.Data.Unit SNSDU

Safety Of Flight SOF

Start.of.Header SOH

System Operator Instructions SOI

Satellite Operational Implementation Team SOIT

Software Operator Manual SOM

Statement of Operational Need SON

Standard Operating Procedure SOP

Standard Operating Procedure Amplified SOPA

Silicon On Sapphire SOS

Statement Of Work SOW

Space SP

Special Purpose Automatic Test Equipment SPATE

_0_

Statistical.Process.Control SPC

Speed SPD

Seller Purchased Equipment SPE

Represented.by.the.symbol.c.and.has.a.value.. Speed of Light

of.2.9979250.x.108.meters/second.or.

983,571,194.feet/second.

Special Position Identification SPI

Designation.for.a.transponder.ident.pulse. SPIP

Speaker SPKR

(.1.).Stabilizer.Position.Modules.. SPM

(.2.).Surface.Position.Monitor..

(.3.).Support.Plan.Manager

Refers.to.a.display.presentation.that.radiates. Spoking

outward.from.the.display.origin.like.the.spokes.on.

a.wagon.wheel.

Sync.Phase.Reversal..(Term.is.used.in.Mode.S. SPR

transponders.)

(.1.).Sensor.Processing.Subsystem.. SPS

(.2.).Standard.Positioning.Service

Squelch SQ or Sql

Service.Quality SQ

Service.Quality/Billing.Processor SQB

Service.Quality.Data SQD

Structured.Query.Language SQL

Signal.Quality.Parameter SQP

A squall line is a line of thunderstorms and Squall Line

developing.thunderstorms.

Reply.to.interrogation.signal.(XPD). Squawk

A.control.and/or.circuit.that.reduces.the.gain.in. Squelch

response of a receiver. The squelch is used to

eliminate.the.output.noise.of.the.receiver.when.a.

signal.is.not.being.received.

_06

(.1.).The.random.pulse.pairs.generated.by.the. Squitter

ground station as a filler signal. .

( 2 ) The transmission of a specified reply

format.at.a.minimum.rate.without.the.need.to.be.

interrogated..(Filler.pulses.transmitted.between.

interrogations).[XPD]...

(.3.).Spontaneous.Transmission.generated.once.

per.second.by.transponders.

Service Request SR

Software Requirements And Design Description SRADD

Static.Random.Access.Memory SRAM

Systems Requirements Document SRD

Selective.Reject SREJ

Selective.Reject.Mode SRM

Short.Range.Navigation-term.used.to.encompass. SRN

VOR/LOC/DME/MB Navigation, or a sub-set

there-of.

Selected.Reference.Point SRP

Satellite.Recognition.Receiver SRR

Satellite.Receiver.Transmitter SRT

Shop.Replaceable.Unit SRU

ShipSet S/S

System.Safety.Assessment SSA

Single.Sideband..An.AM.signal.that.has.a. SSB

reduced.carrier,.with.the.power.applied.to.a.single.

sideband..Since.the.bandwidth.of.the.information-

carrying.signal.is.reduced,.a.better.signal-to-noise.

ratio.is.obtained.at.the.receiver.

Solid-State.Cockpit.Voice/Data.Recorder SSCV/DR

Solid-State.Cockpit.Voice.Recorder SSCVR

Static.Source.Error.Correction SSEC

Solid-State.Flight.Data.Recorder SSFDR

Sign.Status.Matrix:.A.set.of.bits.in.an.ARINC.label. SSM

that.tell.the.status.of.that.label..The.status.can.be.

normal,.fail,.test.or.no.computed.data.(NCD).

_0_

System.Signal.Processor SSP

Secondary.Surveillance.Radar..A.radar-type. SSR

system that requires a transponder to transmit a

reply.signal.

Single.Sideband.Suppressed.Carrier..A.SSSC. SSSC

signal is a band of audio intelligence frequencies

that.have.been.translated.to.a.band.of.radio. frequencies without distortion of the intelligence

signal.

Subsequent Signal Unit SSU

Statistics ST

Station sta

Stabilizer STAB

Represents.the.mean.or.average.properties.of. Standard

the.atmosphere..At.sea.level.static.pressure.is. Atmosphere

29.92.In.Hg.and.temperature.is.+15°C.

A.DME.mode.that.applies.power.to.the.DMERT. Standby Mode

but.the.unit.does.not.transmit.

Standard.Terminal.Arrival.Routes STAR

(.1.).Standard.Terminal.Automation.Replacement. STARS

System..

(.2.).Status.Tracking.And.Reporting.System

Flush-mounted.openings.in.the.skin.of.the.aircraft. Static Ports

fuselage.used.to.sensestatic.pressure.

Ambient.atmospheric.pressure.or.static.pressure. Static Pressure

is.the.force.per.unit.area.exerted.by.the.air.on.the.

surface.of.a.body.at.rest.relative.to.the.air.

RAM.constructed.of.bistable.transistor.elements.. Static RAM Memory cells do not require refreshing. (See

Dynamic.RAM.)

A.correction.applied.to.static.source.pressure. Static Source

measurements.to.partly.or.completely.correct. Error (SSEC)

for pressure errors that are caused by airflow

changes..It.is.computed.as.a.function.of.Mach.

and.altitude.based.on.measured.errors.for.a.

particular.static.system.

Systems.Test.Bed STB

_0_

Standby.Instruments STBY

(.1.).Sensitivity.Time.Control..A.control.circuit. STC

used.in.radar.applications.to.control.receiver.gain.

with.respect.to.time... ( 2 ) Supplemental Type Certificate

Stabilizer.Trim.Control.Module. STCM

(.1.).Standard.. STD

(.2.).System.Technical.Description

Standby.Instruments STDBY

Synchronized.Time.Division.Multiple.Access STDMA

Step.Climb STEPCLB

An AHRS test mode, where “XX” can be OA STIM XX

(Sequence of all tests), 01 (Roll tests), 02 (Pitch

tests),.03.(Heading.test).

Satellite.Telecommunications.Intermediate.Unit STIU

Serial.Transition.Module STM

Short.Takeoff.and.Landing STOL

Standard.Temperature.and.Pressure STP

System.Trouble.Report STR

Stable Time Subfield STS

Start.of.Text STX

Signal.Unit SU

Special.Use.Airspace SUA

Yaw.Damper.Actuator SUL

(.1.).Aileron/Elevator/Rudder.Servo. SUO

(.2.).Servo.Actuator

A.receiver.in.which.the.incoming.RF.signal.is. Super-

mixed to produce a lower intermediate frequency. heterodyne

Receiver

A.pulse.used.to.disable.L-band.avionics.during. Suppressor

the.transmitting.period.of.another.piece.of.L-band. Pulse

airborne equipment. It prevents the other avionics

aboard.the.aircraft.from.being.damaged.or.

interfered.with.by.the.transmission.and.any.noise.

associated.with.that.transmission.

_09

Regional.Supplementary.Procedures SUPPS

(.1.).Autothrottle.Servo.. SUT

(.2.).Stabilizer.Trim.Servo..

(.3.).System.Under.Test

Space.Vehicle SV

(.1.).Service.. SVC

(.2.).Switched.Virtual.Circuit

Smart.Video.Distribution.Unit SVDU

Servo SVO

Service.Readiness.Review SVRR

Synthetic.Vision.System SVS

Servo.Throttle SVT

Satellite.Voice.Unit SVU

Software S/W

Severe.Weather.Avoidance.Program SWAP

System.Wide.Information.Management SWIM

Short.Wavelength.Infra-Red SWIR

Software.Integration.and.Test SWIT

Software Requirements Document SWRD

Software.Test.Readiness.Review SWTRR

Super.Extended.Graphics.Array SXGA

Synchronizing SYNC

Synthetic.Vision.Application SVA

System sys

System Identifier SYS

System.Category.B.(FAA.Message.Format) SYSCAT-B

System Configuration Item SYSCI

Traffic Advisory: TCAS information given to the TA

pilot.pertaining.to.the.position.of.another.aircraft.

in.the.immediate.vicinity.

(.1.).Terrain.Awareness.Display.. TAD

(.2.).Transport.Airplane.Directorate

__0

(.1.).Test.Access.Control.. TAC

(.2.).Thrust.Asymmetry.Compensation..

(.3.).Triacetate.Cellulose

The.Tactical.Air.Navigation.System.that.provides. TACAN

azimuth.and.distance.information.to.an.aircraft. from a ground station (similar to VOR-DME,

however, in the UHF Frequency band).

Tachometer Tach

Test.Access.Control.Interface.Unit TACIU

Terminal Area Forecast (ICAO) TAF

Thermal.Anti-Icing TAI

(.1.).Terminal.Area.Productivity. TAP

(.2.).Tailored.Arrival.Procedure

Trials.ATN.Router TAR

An.aircraft.within.the.surveillance.range.of.TCAS. Target

True.Airspeed TAS

(.1.).Total.Air.Temperature..The.air.temperature. TAT

including.heat.rise.due.to.compressibility...

(.2.).True.Air.Temperature

Terminal Air Traffic Control Automation TATCA

TAU is the minimum time a flight crew needs to TAU

discern.a.collision.threat.and.take.evasive.action..

It.represents.the.performance.envelope.(speed.

and.path.of.aircraft).divided.by.the.closure.rate.of.

any.intruder.aircraft.(TCAS).

Terrain.Awareness.Warning.System TAWS

Transfer.Bus.Breaker TBB

To.Be.Determined TBD

Time Between Overhauls TBO

( 1 ) To Be Specified . TBS

(.2.).To.Be.Supplied

(.1.).Transport.Connection.. TC

( 2 ) Type Certificate

Top-of-Climb T/C

___

(.1.).Terminal.Control.Area. TCA

(.2.).Throttle.Control.Assembly

Traffic Alert Collision Avoidance System: TCAS

Transponder.system.that.talks.to.other.aircraft.

and.determines.their.altitude,.rate,.vertical.speed,.

distance.and.bearing.

A.baseline.system.that.provides.a.warning.(TA).to. TCAS I

the flight crew of the presence of another aircraft

(potential.collision.threat).within.the.surveillance.

area..No.avoidance.maneuver.is.suggested.

A collision avoidance system providing traffic TCAS II

information.(within.approximately.30.nmi.of.

the aircraft) to the flight crew, in addition to the

resolution.advisories.(RA).(for.vertical.maneuvers.

only). A TCAS II-equipped aircraft will coordinate

with TCAS II-equipped intruder aircraft to provide

complementary.maneuvers.

Turbine.Case.Cooling TCC

Type Certificate Data Sheet TCDS

Terrain.Clearance.Floor TCF

Technical.Coordination.Meeting TCM

Test.Content.Management.System TCMS

TACAN TCN

Transmission.Control.Protocol TCP

Transport.Control.Protocol/Internet.Protocol TCPIP

Throttle.Control.Quadrant TCQ

Touch.Control.Steering TCS

(.1.).TACAN.Control.Unit.. TCU

(.2.).Telephone.Conversion.Unit

Temperature Controlled Crystal Oscillator TCXO

Top-of-Descent T/D

Traffic Display: A feature of the TCAS that shows TD

TCAS traffic.

Tower.Data.Link.System TDLS

___

In.the.Time.Division.Multiplex.Systems.a.common. TDM

carrier.is.shared.to.transmit.multiple.messages.

(to.multiple.receivers).by.time.sharing.the.carrier.

between.the.message.sources.

Time.Division.Multiplex.Access..When.multiple. TDMA

transmitters.are.using.a.single.carrier.to.transmit.

to.a.single.receiver,.the.carrier.is.time.shared.

between.each.of.the.transmitters,.so.the.multiple.

messages.are.not.garbled.at.the.receiver.

Time Dilution Of Precision. A term used to TDOP

describe.the.error.introduced.by.variances.in.the.

calculated.time.

Transponder TDR

Tactical.Data.Radio.System TDRS

Terminal.Display.System TDS

Tower.Data.Services.Terminal TDST

Terminal.Doppler.Weather.Radar TDWR

Touch.Down.Zone TDZ

Test Equipment TE

Thermo-Electric.Cooler TEC

Text Element Identifiers TEI

Temperature TEMP

A.sensor.protruding.into.the.airstream.to.sense. Temperature air temperature. Requires correction to get static Probe

air.temperature.

Terminal TERM

(.1.).Terminal.En.Route.Procedures.. TERPS

(.2.).Terminal.Instrument.Procedures

Trials.End.System.(for.ATN) TES

Task.Force.3 TF3

Traffic TFC

Traffic Flow Management TFM

Total Field Of View TFOV

Temporary.Flight.Restriction TFR

__3

Thin.Film.Transistor TFT

Trivial.File.Transfer.Protocol TFTP

Terrestrial.Flight.Telephone.System TFTS

(.1.).Timer-VDL.Management.Entity. TG

(.2.).Transmission.Gate

GS’s.Maximum.Time.Between.Transmissions TG 3

Maximum.Time.Between.GSIF’s.Timer TG 4

Turbulence.Gain.Control TGC

Maximum Link Overlap Timer TGS

Target:.A.weather.radar.annunciator.that.indicates. TGT

weather.ahead.

True.Heading THDG

Threshold THLD

Thrust THR

Throttle.Hold THRHOLD

A target that has satisfied the threat detection Threat logic and thus requires a traffic or resolution

advisory.(TCAS).

Trimmable.Horizontal.Stabilizer.Actuator THSA

(.1.).Telecommunications.Industry.Association.. TIA

(.2.).Type.Inspection.Authorization.

True.Indicated.Airspeed TIAS

Type.Inspection.Report TIR

Traffic Information Service TIS

Traffic Information System-Broadcast TIS-B

Track.Angle TK

Track.Angle.Error TKE

Top-Level T/L

Terminal.Location.(ACARS/AFEPS) TL

Thrust.Lever.Angle TLA

Target.Language.Compiler TLC

Telemetry.Word TLM

__4

Target.Level.of.Safety TLS

Timer-Media.Access.Control TM

Traffic Management Advisor TMA

Thrust.Management.Computer TMC

Thrust.Management.Computer.Function TMCF

Thrust.Management.Computer.System TMCS

Thrust.Management.Function TMF

(.1.).Thrust.Management.System. TMS

( 2 ) Traffic Management System

Traffic Management Unit TMU

(.1.).True.North.. TN

(.2.).Twisted.Nematic

Take Off TO

(.1.).Top.of.Climb.. TOC

(.2.).Transfer.of.Communications

Top.of.Descent TOD

Takeoff.Engine.Pressure.Ratio TO EPR

Indicates.whether.the.omnibearing.selected.is.the. TO/FROM

course to or from the VOR ground station. Indicator

Take Off, Go-Around. Also seen as TO/GA. TOGA

Take Off Engine Fan Speed TO N_

Terms.of.Reference TOR

Total TOT

The.point.at.which.the.predetermined.glide.path. Touchdown

intercepts.the.runway.

Time Of Week TOW

Tire.Pressure.Monitor.Unit TPMU

Test.Point TP

Transport.Protocol.Class.4 TP4

Transport.Protocol.Data.Unit TPDU

Terminal.Permission.List.(ACA.RS/AFE.PS) TPL

Technical.Performance.Management TPM

___

Transponder TPR

Throttle.Quadrant.Assembly TQA

Temporary.Revision..A.document,.printed.on. TR

yellow.paper.that.temporarily.amends.a.page.or.

pages.of.a.component.maintenance.manual.

(.1.).Thrust.Reverser.. T/R

(.2.).Transceiver.(see.RT).

(.3.).Transmitter-Receiver

(.1.).Temporary.Reserved.Airspace. TRA

(.2.).Thrust.Reduction.Altitude

Terminal.Radar.Approach.Control TRAC

(.1.).The.actual.path,.over.the.ground,.traveled.by. Track

an.aircraft.(navigation)...

(.2.).In.this.mode.the.DME.transmits.a.reduced.

pulse pair rate after acquiring lock-on (DME). .

(.3.).Estimated.position.and.velocity.of.a.single.

aircraft.based.on.correlated.surveillance.data.

reports.(TCAS).

Terminal.Radar.Approach.Control TRACON

Test.and.Repair.Control.System..An.automated. TRACS

data.retrieval.system..TRACS.functions.include:.

1).provide.the.location.of.any.given.unit.at.any. time; 2) provide an efficient flow of work to and

from test stations; 3 ) provide quick access to

quality information generated by the actual testing

process.(performed.by.the.technician);.4).provide.

statistical.and.historical.data.regarding.throughput.

time.for.products,.failure,.yield.rates,.WIP,.etc.

Information.given.to.the.pilot.pertaining.to.the. Traffic Advisory

position.of.another.aircraft.in.the.immediate.

vicinity..The.information.contains.no.suggested. maneuvers. (Traffic advisory airspace is 1200 feet

above.and.below.the.aircraft.and.approximately.

45.seconds.distant.with.respect.to.closure.speed.

of.the.aircraft.).[TCAS]

__6

The number of transponder-equipped aircraft Traffic Density

within.R.nautical.miles.(nmi).of.own.aircraft,.

divided by x (R nmi) 2. Transponder-equipped

aircraft.include.Mode.S.and.ATC.RBS.Mode.A.

and.Mode.C,.and.excludes.own.aircraft..(TCAS)

Transition TRANS

A.receiver.and.transmitter.combined.in.a.single. Transceiver

unit..Same.as.RT.

Avionics equipment that returns an identifying Transponder

coded.signal.

Turbulence.(TURB):.A.weather.radar.warning.of. TRB

approaching.turbulence.

Transit.Routing.Domain TRD

Track:.The.course.the.aircraft.is.traveling.along. TRK

the.ground.with.respect.to.true.North.

Tracking and Resolution Of Obsolete Parts TROOP

Mode.S.Transponder TRP

(.1.).Test.Readiness.Review.. TRR

(.2.).Test.Rejection.and.Repair

Time.Reference.Scanning.Beam..The. TRSB

international.standard.for.MLS.installations.

( 1 ) Transformer Rectifier Unit . TRU

(.2.).True

The.true.velocity.of.the.aircraft.through.the. True Airspeed

surrounding.air.mass.

The.exact.distance.above.mean.sea.level. True Altitude

(corrected.for.temperature).

The.bearing.of.a.ground.station.with.respect.to. True Bearing

true.north.

The.direction.of.the.north.pole.from.the.observer. True North

(.1.).Time.Source.. TS

(.2.).Transport.Service. ( 3 ) Traffic Synchronization

(.1.).Tail.Strike.Assembly. TSA

(.2.).Technical.Service.Agreement

___

Transport.Service.Access.Point TSAP

Term.Service.Commitment TSC

Transport.Service.Data.Unit TSDIU

Total.System.Error TSE

Trimble.Standard.Interface.Protocol TSIP

Autothrottle.Servo.Mount.(without.Clutch) TSM

(.1.).Transmitted.Signal.Power.. TSP

(.2.).Twisted.Shielded.Pair

Technical Standard Order. Every unit built with a TSO

TSO name plate must meet TSO requirements.

TSO operating temperature extremes are not the

same.as.the.manufacturing.burn-in.limits.

Technology.Support.and.Services TSS

Time.Source.Transition.Module TSTM

(.1.).Test.Tools.. TT

(.2.).Total.Temperature

Total.Inlet.Temperature.(Engine) TT_

Time.To.First.Fix TTFF

Time.To.Go:.The.time.from.present.position.to. TTG the next navigation fix based on current aircraft

ground.speed.

Transistor-Transistor.Logic TTL

TCAS.II.Receiver/Transmitter TTR

Time.To.Station,.an.indication.that.displays.the. TTS

amount.of.time.for.an.aircraft.to.reach.a.selected.

DME.ground.station.while.traveling.at.a.constant.

speed.

Tele.typewriter TTY

Smart.Tapping.Unit TU

Test.Unit.Adapters TUA

Turbulence TURB

___

The U.S. National Weather Service defines light Turbulence

turbulence.as.areas.where.wind.velocity.shifts.

are.0.to.19.feet.per.second.(0.to.5.79.meters.

per.second).and.moderate.turbulence.as.wind.

velocity.shifts.of.19.to.35.feet.per.second.(5.79.to.

10.67.meters.per.second).

Turbine.Vane.and.Blade.Cooling TVBC

Turbine.Vane.Cooling TVC

Total.Vertical.Error TVE

Test.Vector TVEC

(.1.).Terminal.Weather.Data.Link. TWDL

(.2.).Two.Way.Data.Link

Terminal.Doppler.Weather.Radar TWDR

Terminal.Weather.Information.for.Pilots TWIP

Tailwind TWND

Technical.Work.Program TWP

Turbulence.Weather.Radar TWR

Traveling.Wave.Tube TWT

Transmit.(see.XMIT):.An.annunciation.that.may. TX

be.displayed.on.the.Communications.Radio.

Controller.(CTL,.CDU,.RTU).while.a.radio.signal.

is.being.transmitted.

(.1.).Unnumbered.Acknowledgment.. UA

(.2.).User.Application

Universal.Asynchronous.Receiver/Transmitter UART

Universal.Avionics.Systems.Corp. UASC

Universal.Access.Transceiver UAT

Unmanned.Air.Vehicle UAV

Utility.Bus UB

Uplink Block Identifier UBI

User.Computer.Interface UCI

Uniform.Chromaticity.Scale UCS

__9

User.Data..The.N-User.data.may.also.be. UD

transferred between peer network members (OSI

Model) as required.

User.Datagram.Protocol UDP

Universal.Flight.Data.Recorder UFDR

Ultra-High Frequency. The portion of the radio UHF

spectrum.from.300.MHz.to.3.GHz.

Unnumbered.Information UI

Upper flight Information Region UIR

Uplink UL

Underwater.Locator.Beacon ULB

Unit.Load.Device ULD

User-Modifiable Information UMI

Unified Modeling Language UML

User-Modifiable Software UMS

User-Modifiable Software Development Tool UMSDT

Universal.Mount UMT

A DME channel without a corresponding VOR or Unpaired

ILS frequency. Channel

The.radio.transmission.path.upward.from.the. Uplink

earth.to.the.aircraft.

Universal.Platform UP

User.Preferred.Route UPR

Universal.Platform.Resource.Management UPRM

UPS.Management.System UPSMS

Uninterruptible.Power.Supply UPS

United.States.Air.Force USAF

Upper.Sideband.is.the.information-carrying.band. USB

and is the frequency produced by adding the

carrier frequency and the modulating frequency.

Unstabilized USTB

Universal.Time.Coordinated.(French) UTC

Universal.Trigger.Engine UTE

__0

Unshielded.Twisted.Pair UTP

Unit.Under.Test UUT

Upper.Sideband.Voice UV

Unique Word UW

(.1.).Velocity.. V

(.2.).Volt

Critical.engine.failure.velocity..A.pilot.selectable. V ( _ )

speed.on.the.PFD.

Takeoff.rotation.speed..A.pilot.selectable.speed. V ( R )

on.the.PFD.

Takeoff.safety.speed..A.pilot.selectable.speed.on. V ( _ )

the.PFD.

A general target speed for flight. A pilot selectable V ( T )

speed.on.the.PFD.

Volt-Amperes VA

Volts.Alternating.Current VAC

(.1.).Value.Added.Processor.. VAP

(.2.).Visual.Aids.Panel

(.1.).Virtual.Applications.Prototyping.System.. VAPS

(.2.).Virtual.Avionics.Prototyping.System

(.1.).Variation.. VAR

(.2.).Visual-Aural.Radio.Range.

(.3.).Volt-Amps.Reactive

Visual.Approach.Slope.Indicator VASI

Voltage.Averaging.Unit VAU

PFD.Flight.Director.Symbology.for.which.the. V BAR

command.bars.move.vertically.for.pitch.command.

and.rotate.for.roll.command.

Variable.Bypass.Valve VBV

(.1.).Design.Cruising.Speed.. VC

(.2.).Virtual.Circuit

Virtual.Circuit.Bridge VCB

(.1.).Variable.Capacitance.Diode.. VCD

(.2.).Voltage.Controlled.Device

___

Active.Maximum.Control.Speed VCMAX

Active.Minimum.Control.Speed VCMIN

Variable Controlled Oscillator VCO

VDL.Control.Unit VCU

(.1.).Design.Diving.Speed.. VD

(.2.).Heading.to.a.DME.Distance

Volts.Direct.Current VDC

VHF.Data.Link VDL

VHF.Data.Link.Mode.X VDL Mx

VHF.Digital.Radio VDR

Version VER

Video.Entertainment.System VES

The.rate.of.change.of.pressure.altitude,.usually. Vertical Speed

calibrated.in.hundreds.of.feet.per.minute.

Design.Flap.Speed VF

Flaps.Extended.Placard.Speed VFE

Variable Frequency Oscillator VFO

Visual Flight Rules Operations Panel VFOP

Visual.Flight.Rules VFR

Flap.Retraction.Speed VFXR (R)

Flap.Extension.Speed VFXR (X)

Vertical.Gyro/Directional.Gyro VG/DG

Ground.Velocity VG or VGND

Video.Graphics.Adapter VGA

Maximum Level-flight Speed with Continuous VH

Power

Very.High-speed.integrated.circuit.Hardware. VHDL

Description.Languages

Very High Frequency. The portion of the radio VHF

spectrum.from.30.to.300.MHz.

Very.High.Speed VHS

Very.High.Speed.Integrated.Circuits-Phase.2 VHSIC-_

___

Heading.to.a.course.intercept VI

VOR/ILS Receiver VIR

Lowest.Selectable.Airspeed VIs

Video.Intelligence.System VIS

Variable.Integral.Guide.Vane VIGV

Virtual.Integrated.Software.Testbed.for.Avionics VISTA

Video.Interface.Unit VIU

VOR/Localizer V/L

Landing.Gear.Extended.Placard.Airspeed VLE

Very Low Frequency VLF

Maximum Landing Gear of Operating Speed VLO

Lift-off.Speed VLOF

Very.Large.Scale.Integration VLSI

Valve VLV

Heading.to.a.manual.termination VM

Voltmeter V/M

Basic.Clean.Aircraft.Maximum.CAS VMAX

(.1.).Visual.Meteorological.Conditions. VMC

(.2.).Minimum.Control.Speed.with.Critical.Engine.

Out

(.1.).Versa.Module.Eurocard.Bus. VME

(.2.).VHF.Management.Entity,.VME.bus

Versa.Module.Eurocard.Card.Cage VMECC

Basic.Clean.Aircraft.Minimum.CAS VMIN

Minimum.Maneuver.Speed VM (LO)

Visual.Meteorological.Conditions VMC

The.maximum.airspeed.at.which.an.aircraft.is. Vmo

certified to operate. This can be a fixed number

or a function of configuration (gear, flaps, etc.), or

altitude,.or.both.

Velocity, Maximum Operating/Mach, Maximum VMO/MMO

Operation

VNMS.Health.Monitoring VMON

__3

Virtual Machine Operating System VMOS

Vertical.Navigation:.(Also.VNV)..A.system.by. V/NAV

which the crew can define a vertical path in space

and.the.system.can.output.guidance.to.maintain.

that.path.

Never-Exceed.Speed VNE

Maximum.Structural.Cruising.Speed VNO

VHF.Navigation.Receiver VNR

Vertical.Navigation VNV

Voice.Radio VOCRAD

Video On Demand VOD

Voice Over Internet Protocol VoIP

A.CALSE.L.function.that.would.automatically. Voispond

identify.an.aircraft.by.a.voice.recording..Voispond.

is.not.yet.implemented.

Volt-Ohm-Millimeter VOM

VHF Omnidirectional Radio Range. A system that VOR

provides.bearing.information.to.an.aircraft.

A system in which a VOR and DME station are VOR/DME

co-located.

VOR/Marker Beacon VOR/MB

A system in which a VOR and a TACAN station VORTAC

are.co-located.

Velocity Of Sound VOS

Voice.Transmission VOX

Vertical.Path VPATH

(.1.).Vendor.Part.Number.. VPN

(.2.).Virtual.Private.Networks

(.1.).Takeoff.Rotation.Velocity. VR

(.2.).Heading.to.a.radial

Video.Random.Access.Memory VRAM

Reference.Velocity VREF

VDL.Reference.Guide VRG

Video.Reproducer.Unit VRU

__4

Vertical.Speed V/S

Stall.Velocity Vs

Automatic.look-up.and.display.of.takeoff,. VSpeeds

approach,.landing.and.missed-approach.speeds.

Stall.Warn.Velocity Vsw

Very.Small.Aperture.Terminal VSAT

Variable Speed Constant Frequency VSCF

(.1.).Vertical.Stabilizer.Control.System.used.on. VSCS NOTAR helicopter .

(.2.).Voice.Switching.and.Control.System

( 1 ) VDL Specific DTE Address . VSD

(.2.).Vertical.Situation.Display

(.1.).Vertical.Speed.Indicator. VSI

( 2 ) Stalling Speed in a Specified Flight

Configuration

Vertical.Speed.Limit.Advisory.may.be.preventive. VSL Advisory

or.corrective.(TCAS)

Vertical.Separation.Minimum VSM

Stalling Speed in the Landing Configuration VSO

Vertical.or.Short.Takeoff.and.Landing VSTOL

Variable.Station.Vane VSV

Voltage-Standing.Wave.Ratio..The.ratio.of.the. VSWR

amplitude of the voltage (or electric field) at a

voltage.maximum.to.that.of.an.adjacent.voltage.

minimum..VSWR.is.a.measurement.of.the.

mismatch.between.the.load.and.the.transmission.

line.

Vertical.Track.Distance VTK

Volumetric Top-Off VTO

Vertical.Takeoff.and.Landing VTOL

Variable.Takeoff.Rating VTR

Vertical.Track V/TRK

Utility.Speed VU

Speed.for.Best.Angle.of.Climb VX

Speed.for.Best.Rate.of.Climb VY

___

(.1.).Watt.. W

(.2.).West

Wide.Area.Augmentation.System.(Method.of. WAAS

Differential.GPS)

Wide.Area.Differential WAD

Wide.Area.Differential.Global.Navigation.Satellite. WADGNSS

System

World.Area.Forecast.System WAFS

Wing.Anti-Ice WAI

Wide.Area.Network WAN

World.Administrative.Radio.Conference.(1992) WARC-9_

World.Administrative.Radio.Conference.for.the. WARC-MOB

Mobile.Service

Weight.and.Temperature WAT

West.Atlantic.Route.Structure WATRS

A position along a route of flight. Navigation Waypoint

aid,.airport,.or.geographic.point.a.pilot.uses.to.

navigate.the.aircraft.

Weight.and.Balance.Computer WBC

Work.Breakdown.Structure WBS

WXR.Control.Panels WCP

Wind.Direction WD

Warning.Electronic.System WES

Warning.Electronic.Unit WEU

WXR.Flat.Plate.Antenna WFA

World.Geodetic.System WGS

World.Geodetic.Survey.of.1972 WGS-__

World.Geodetic.System.1984 WGS-_4

A sequence of ATCRBS interrogations and Whisper Shout

suppressions.of.varying.power.levels.transmitted.

by TCAS equipment to reduce severity of

synchronous.interference.and.multipath.

problems.

__6

An.imaginary.line.joining.the.leading.and.trailing. WING CHORD

edges.of.the.wing.

Wind.Magnitude WINDMG

Wind.Direction WINDR

Work.In.Progress WIP

Wireless.Local.Area.Network WLAN

Welded.Pipe.and.Tube WLD

Wireless.LAN.Manager WLM

WXR.Antenna.Pedestal.and.WXR.Waveguide. WMA

Adapter

WXR.Indicator.Mount WMI

World Meteorological Organization WMO

With Modification of Vertical Profile W/MOD

Wide-area.Master.Station WMS

Weather.Message.Switching.Center WMSC

Weather.Message.Switching.Center.Replacement WMSCR

WXR.Mount WMT

Week.Number WN

Grouping.of.bits..Size.of.group.varies.from. WORD

microprocessor.to.microprocessor.

Weight On Wheels WOW

Working.Paper WP

Waypoint. A defined geographic point used as a WPT

reference.for.navigation.

Waypoint.Position.Report WPR

Weather.Radar.Attention.Unit WRAU

Wide-area.Reference.Station WRS

WXR.Receiver/Transmitter WRT

Weather.Support.for.Deicing.Decision.Making WSDDM

With.Step.Change.in.Altitude W/STEP

Weight WT

Weather WX

___

WXR.Indicator WXI

Weather.Radar.Panel WXP

Weather.Radar.System WXR

World.Wide.Web WWW

Waypoint.Altitude WYPT

ARINC XA

The frequency range between 8000 and . X-BAND

12500.MHz

International.Air.Transport.Association.(IATA) XB

A.DME.channel..There.are.126.X-channels.for. X-Channel

DME operation. For the first 63 channels, the

ground-to-air frequency is 63 MHz be low the

air-to-ground frequency. For the second 63-X

Channels the ground-to-air frequency is 63 MHz

above the air-to-ground frequency.

Transceiver XCVR

Transfer XFR

Exchange Identification XID

Cross-side XLS

Translator XLTR

External.Master XM

Transmit XMIT

eXtended.Markup.Language XML

Transmitter/Receiver XMTR/RCVR

ATC.Transponder.(also.XPDR,.X.PNDR,.TPR) XPD

Transponder XPDR

Cross Pointer: The flight director command bars. XPTR

Pitch.command.is.shown.with.vertical.motion.of.

the.horizontal.bar.and.roll.command.is.shown.

with.lateral.motion.on.the.vertical.bar.

SITA XS

Cross-side XSIDE

X/Open Transport Interface XTI

___

Crosstrack.(crosstrack.error) XTK

Express.Transfer.Protocol XTP

An.antenna.with.its.maximum.radiation.parallel. Yagi Antenna

to.the.long.axis.of.its.array,.consisting.of.a.driven.

dipole, a parasitic dipole reflector, and one

parasitic.dipole.director.or.more.

Refers.to.movement.about.the.vertical.axis.of.the. YAW

aircraft

Yaw.Stability.Augmentation.System YSAS

Yaw.Damper YD

( 1 ) Refer to reflectivity factor . Z

(.2.).Zulu.(GM.Time)

Zone Distribution Equipment ZDE

Zero.Fuel.Weight ZFW

A.marker.beacon,.sometimes.referred.to.as.a. Z-Marker

station locator, that provides positive identification

to.the.pilot.when.the.aircraft.is.passing.directly.

over a low-frequency navigation aid.

Zulu.Time Z

__9

For more information contact:

Rockwell Collins

400 Collins Road NE

Cedar Rapids, Iowa 52498

319.295.4085

Fax: 1.319.295.2297

E-mail: csmarketing@rockwellcollins.com

Web site: www.rockwellcollins.com

147-0427-000-CS 08/05 12M BUS © 2005, Rockwell Collins, Inc., All Rights Reserved, Printed in USA