Communications R 01

7/30/2019 Communications R 01

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Directorate of OperationalSlide 1 of 24

737-300/400

COMMUNICATIONS

NextMain Menu Quit
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Audio Selector Panel

(ASP)


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MIC SELECTOR (Transmitter Selector)

Switches:

Illuminated

Related switch is active.

Push

Selects related communication system fortransmission.

Only one switch may be selected at a time;

pushing a different switch deselects active

switch.

Receiver is also selected regardless of

whether or not related receiver switch is

on.


(ASP)


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(ASP)Receiver Switches:

Illuminated

Related switch is active.

Push

Receiver selected for related

communication system or navigationreceiver.

More than one switch may be selected

at a time.

Push again

Deselects related system or receiver.

Rotate

Adjusts volume.


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(ASP)SPKR Switch:

Illuminated

SPKR switch is active.

Push

Audio from selected receiver switches is

heard from overhead speaker.

Push again

Deselects audio from selected receiver

switches to be heard from overhead

speaker.

RotateAdjusts overhead speaker volume.


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(ASP)Push-to-talk Switch:

(spring-loaded to center)

R/T (radio-transmit)

Keys boom or oxygen mask microphone for

transmission as selected by transmitter

selector.

I/C (intercom)

Keys boom or oxygen mask microphone for

direct transmission over flight interphone

and bypasses transmitter selector.


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(ASP)MASK-BOOM Switch:

MASK

Selects oxygen mask for transmissions.

BOOM

Selects boom microphone for

transmissions.





(ASP)Filter Switch:

V (voice)

Receive NAV and ADF voice.

B (both)

Receive NAV and ADF voice and range

signals.

R (range)

Receive NAV and ADF station identifier

range (code) audio.





(ASP)ALT-NORM Switch:

NORM (normal)

ASP operates normally.

ALT (alternate)

ASP operates in degraded mode

(see slide 19 for more information).




VHF Communication Panel

1

1 AS INSTALLED




1

1 AS INSTALLED


Frequency Indicator:

Indicates selected frequency.




1

1 AS INSTALLED


VHF Communication Transfer (TFR) Switch:

Selects which frequency is active for the

transceiver.




1

1 AS INSTALLED


Active Frequency Light:

Illuminated

Indicates associated frequency is selected.


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1

1 AS INSTALLED


FREQ SEL (Frequency Selector):

Rotate

Outer selector changes three left digits. Inner selector changes two right digits.


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1

1 AS INSTALLED


COMM TEST Switch:

Push

Removes automatic squelch feature,permitting reception of background noise

and thereby testing receiver operation.

Improves reception of weak signals.


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Miscellaneous Communication Controls(typical configuration in flight deck)

OverheadSpeaker

Boom

Microphone /

Headset

Headphones

Oxygen Mask

Microphone

Hand Held Mike

Push-to-talk Switch

Communication

Jacks

BOOM MIKE HEAD PHONE HAND MIKE

Hand Microphone

(view from back)

MIC

INT

Control Wheel

Push-to-talk Switch MIC (Microphone)

Selects oxygen mask or

boom microphone for

transmission, as selected

by ASP.

INT (Interphone)

Selects oxygen mask or

boom microphone for direct

transmission over flightinterphone.


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Interphone and Passenger

Address Controls

See picture of

service interphone

switch

See picture of

interphone jacks

on external power

connector panel

Service Interphone

Switch(see slide 23 for more info)

SERVICE

INTERPHONE

OFF

ON

INTERPHONE

FLIGHT SERVICE

LOCATED ON AFT

OVERHEAD PANEL

Flight Interphone

Jack

Service Interphone

Jack

Passenger Address Hand Microphone:

Used to make PA announcements

Service Interphone Handset:

Used to communicate with

flight attendant stations. Also

used to communicate with any

external jack location when

SERVICE INTERPHONE switch

is ON.

LOCATED ON EXTERNAL

POWER CONNECTOR PANEL

VIEW OF BACK SIDE

OF CONTROL STAND
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Call System

ATTEND

CALL

GRD

CALL

PILOT

CALL

CALL SYSTEM

CAPTAIN ATTENDANT RESET

Ground Call Switch:

Sounds a horn in nose gearwheel well until released.

Attendant Call Switch:

Sounds a two-tone chime in

passenger cabin. Illuminates

both pink master call lights.

Flight Deck CALL Light:

Illuminated (blue) Flight deck

is being called by flight

attendants or ground crew.

Extinguishes when CAPTAIN

CALL or PILOT CALL switch

released.

LOCATED ON FWDOVERHEAD PANEL

LOCATED ON FWD AND AFT

CEILING OF PASSENGER

CABIN

LOCATED ON

EXTERNAL POWER

CONNECTOR PANELLOCATED ON

FLIGHT ATTENDANT

PANELS

Pilot Call Switch:

Push Sounds a single-tone

chime in flight deck. Flight deck

CALL light extinguishes when

switch is released.

Captain Call Switch:

Push Sounds a

single-tone chime in

flight deck. Flight

deck CALL light

extinguishes when

switch is released.

Attendant Call

Switch:

Push Sounds a

two-tone chime in

passenger cabin.

Illuminates both pink

master call lights.

Call Reset Switch:

Push

Extinguishes both

pink master call

lights.

Master Call Lights:

Illuminated

Amber A lavatory call switch

is activated or smoke has been

detected in a lavatory.

Pink Flight deck or other

flight attendant station is

calling.

Blue A passenger seat callswitch is activated.

This concludes the general

review of the

Communication system.

The remainder of the

presentation will discuss

some extra details.

Click Next to continue.


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Audio Selector Panel (ASP)Degraded Audio System

If the remote electronics unit (located in the E&E bay) or ASP malfunctions, the ASP cannot control theremote electronics unit. Audio system operation can be switched to a degraded mode by placing the

ALT-NORM switch to ALT. In this mode, the ASP at that station (Captain, First Officer, or observer) is

inoperative and the crewmember can only communicate on one radio.


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The picture below depicts which items are operable and which items are inoperable when the Captains

ASP ALT-NORM switch is positioned to ALT.

inop

OK

Captains control

wheel push-to-talk

switch MIC position

OK.Captains control

wheel push-to-talk

switch INT position

inop.

Handheld mic inop.

Transmitter selector

switches inop.

Transmit on VHF 1

only. Receiver switches

inop. Pre-set volume

on headset.

Boom and oxygen

mask mics OK.

Overhead speakerinop.

Push-to-talk switch

R/T position OK.

Push-to-talk switch

I/C position inop.


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The picture below depicts which items are operable and which items are inoperable when the First

Officers ASP ALT-NORM switch is positioned to ALT.

inop

OK

First Officers control

wheel push-to-talk

switch MIC position

OK.First Officers control

wheel push-to-talk

switch INT position

inop.

Handheld mic inop.


switches inop.

Transmit on VHF 2



on headset.

Boom and oxygen

mask mics OK.

Overhead speakerinop.

Push-to-talk switch

R/T position OK.

Push-to-talk switch

I/C position inop.


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The picture below depicts which items are operable and which items are inoperable when the observers

ASP ALT-NORM switch is positioned to ALT.

inop

OK


switches inop.

Transmit on VHF 1



on headset.

Boom and oxygen

mask mics OK.

Push-to-talk switchR/T position OK.

Push-to-talk switch

I/C position inop.


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Service InterphoneThe Service Interphone provides intercommunication between the flight deck, flight attendants, and

ground personnel. Flight deck crew members communicate utilizing the service interphone handset (if

installed on control stand) or their respective boom microphone via the ASP. In addition, several externaljacks for use by maintenance or ground personnel can be activated by positioning the service interphone

switch to ON.

External service interphone jack located

near access door leading to horizontal

stabilizer jackscrew.

External service interphone jack located

on external power connector panel.

External service interphone jack located in E&E bay.

External service interphone jack located nearaircraft right wing root.

External service interphone jack located nearaircraft left wing root.

External service interphone jack located on

fueling panel.

External service interphone jack

located on ceiling near aft lavatory.


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Antenna LocationsVOR/LOC

ADF SENSE

(left side)

AIRPHONE

MARKER

BEACON

DME 2

ADF LOOP 1

VHF COMM 2

DME 1

RA RECEIVE 2

RA TRANSMIT 2

RA TRANSMIT 1

RA RECEIVE 1

ATC 2

ATC 1TCAS

DUAL

LOCALIZER

ANTENNA

WEATHER

RADARGLIDESLOPE

TCASVHF COMM 1
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Documents

Communications R 01