Study Setup for spinLatest SpecificationTest CaseUnderlying
ErrorRequirement endeec: do :: sync_eec?_; atomic {
/* account for bus fault */ mtpafault1 = (tpafault1 ||
busfault); mtpafault2 = (tpafault2 || busfault); mtpafault3 =
(tpafault3 || busfault);
ntpafault = mtpafault1 + mtpafault2 + mtpafault3;
/* Detect movement */
/* BEGIN TRACE 24 CSS-197-149-2.3 */ /* movTPA1 = | otpa1_u -
tpa1_u | > tpamovt */ if :: otpa1_u == tpa1_u -> movTPA1 = 0
:: otpa1_u - tpa1_u - 1 >= tpamovt -> movTPA1 = 1compare
CSS_Acquire Valid Throttle Reso
Object TypeIdCSS Engine/Airframe FunctionsChange
StatusRationaleGuidance
Heading1 Acquire Valid Throttle Resolver angle - TRA -
Measurement for A380Unchanged
Heading1.1 PurposeUnchanged
Informative TextTo provide a validated TRA signal and status for
Engine control, and identify any system failures to
maintenance.Unchanged
Heading1.2 System Use CaseUnchanged
Informative TextUnchanged
Heading1.3 System Architecture DiagramUnchanged
Informative TextHardwired TRA Resolver
configurationUnchanged
Informative TextUnchangedECM AR-1317 - 2.2
Heading1.4 System DescriptionUnchanged
Informative TextWhen not in autothrust mode control of the
Engine will be achieved by modulation of a throttle lever situated
in the cockpit. Movement of the throttle lever will be detected by
two, mechanically coupled resolver transducers producing electrical
signals deUnchanged
Informative TextUnchanged
Informative TextEach resolver is connected to the EEC via 6 wire
cables, with 2 wires for excitation and 4 wires for sine and cosine
return.Unchanged
Informative TextIn addition to the two resolver TRA inputs
(analogue), the EEC receives, via the AFDX network, three digital
throttle angle (TPA) values sent by the PRIMs for each throttle.
Each PRIM measures the throttle lever angle using a potentiometer
installed on eUnchanged
Informative TextThe analogue and digital throttle lever angle
inputs are respectively referred to as TRA (Throttle Resolver
Angle) and TPA (Throttle Potentiometer Angle).Unchanged
Informative TextThe TPA values coming from each PRIM are
identical on both EEC channels (same Virtual Link received by each
EEC channel).Unchanged
Informative TextNote: Only the channel B of each PRIM will send
the throttle angle measurement.Unchanged
Informative TextFor the purpose of the TRA selection logic, the
EEC will also use the TCM hardwired discrete signal, (not shown in
diagram). The TCM hardwired discrete is set 'true' during critical
flight phases and is used if there is a TRA signal
fault.Unchanged
Informative TextUnchanged
Informative TextUnchanged
Heading1.5 Reference MaterialUnchanged
Heading1.5.1 Source ReferenceUnchanged
Informative TextDNS49493Iss 10TRENT 500 FRD Airframe
InputsUnchanged
Informative TextDNS53531Iss 10TRENT 500 Interface Control
DocumentUnchanged
Informative TextTDR9700Iss 2RB211 - TRENT 700 FRD Airframe
Inputs and Thrust SettingsUnchanged
Informative TextECM AR-1317 TRA Selection and Accommodation
LogicUnchanged
Informative TextECM AR-2355SDS TRA Selection
RequirementsUnchanged
Heading1.5.2 Lessons learned, HIPLs, ERMSUnchanged
Informative TextNew implementation, no applicable lessons
learned.Unchanged
Heading1.6 System RequirementsUnchanged
Heading1.6.1 Pre-ConditioningUnchanged
RequirementCSS197-31-2.3Establish the validity of each resolver
(TRA) signal by checking that it is within allowable range and has
not been declared invalid by the OS.UnchangedSuch that the
selection logic can ignore bad data.
RequirementCSS197-32-2.3Establish the validity of each AFDX
input signal and select/provide a valid TPA value.UnchangedTo
provide an alternative signal for resolver arbitration.
Heading1.6.2 Normal BehaviourUnchanged
RequirementCSS197-34-2.3Provide a valid Throttle Lever Angle by
taking the average of the two TRA resolver signals.UnchangedFor
best accuracy
Heading1.6.3 Anomalous BehaviourUnchanged
Informative TextNoneUnchanged
Heading1.6.4 Failure BehaviourUnchanged
RequirementCSS197-40-2.3If both TRA signals are valid and
disagree by more than dvTRAXCTol degrees then select the TRA signal
in nearest agreement with the valid TPA value (provided no TRA-TPA
disagreement has been set for that signal). The rejected TRA signal
shall be latched aUnchangedExclude failed signal on confirmation
with AFDX signal
Informative TextIn the case of a disagreement between the two
TRAs or in case of a TRA signal failure, the selected TPA signal
(if valid) shall be used in this selection logic.Unchanged
RequirementCSS197-209-2.3The crosschecks between valid TRA
signals and selected TPA shall only be performed when the throttle
is not moving.UnchangedEliminate false detection of faults due to
signal latency.
RequirementCSS197-42-2.3Throttle movement shall be determined to
be in progress if two or more valid signals, out of the two TRA
signals and the selected TPA signal, are changing at a rate of more
than the threshold. If one signal is confirmed invalid, it shall be
treated as notUnchangedTo allow detection of frozen signals.
RequirementCSS197-43-2.3The rate of change threshold of
dvTPAMovDet deg/s shall be lowered to dvTPASSDet deg/s when one
valid signal exceeds dvTPAMovDet deg/s; it shall return to
dvTPAMovDet deg/s when all valid signals are moving at a rate of
less than dvTPASSDet deg/s.UnchangedHysterysis is applied to
movement detection to prevent intermittent detection.
RequirementCSS197-44-2.3Following throttle movement there shall
be a confirmation period of dvTPAMovConf seconds before the
movement detection become false.UnchangedTo allow signals to settle
after transient.
RequirementCSS197-45-2.3The crosscheck tolerance between the TRA
signals and selected TPA shall be set to dvTRATPAXCTol
deg.Unchanged
RequirementCSS197-46-2.3A crosscheck failure between a TRA
signal and selected TPA shall be confirmed during dvTRATPAXCConf
seconds. During the confirmation time, the last valid selected TRAV
shall be held.UnchangedInhibit short duration faults from latching
fault.
RequirementCSS197-47-2.3If (both TRA signals are valid but
disagree and the TPA selection is not valid) or (both TRA signals
disagree and neither agrees with TPA) then the validated TRA shall
be set to reverse idle if last good TRA < dvTRAReverseDetect
degrees and Aircraft is onUnchangedIf no valid signals available
select forward or reverse idle based on last good value.
RequirementCSS197-48-2.3If only one TRA is valid then it shall
be selected provided it agrees with the valid TPA.UnchangedUse TPA
to validate single TRA.
RequirementCSS197-49-2.3If only one TRA is valid and TPA
selection is invalid, then select valid TRA if the Aircraft
permission discrete is not set. If the Aircraft permission discrete
is set and the remaining valid TRA value is above idle, then select
forward idle, otherwise seUnchangedInhibit use of a single signal
in critical flight phases.
RequirementCSS197-51-2.3If only one TRA is valid and it
disagrees with a valid TPA value, then select the valid TPA value.
If valid TPA value is above idle and ((the Aircraft permission
discrete is set) OR (the PRIM indicates that three throttles are at
idle or below and Mach nuUnchanged
RequirementCSS197-52-2.3If both TRA signals are invalid and the
TPA signal is valid, then select TPA. If valid TPA value is above
idle and ((the Aircraft permission discrete is set) OR (the PRIM
indicates that three throttles are at Idle or below and Mach number
is below 0.35)),Unchanged
RequirementCSS197-53-2.3If both TRA signals and the TPA signal
are invalid then select reverse idle if last good TRA <
dvTRAReverseDetect degrees and Aircraft is on ground, otherwise
select a value as a function of Mach number.UnchangedIf no signals
are available, Mach number is used to determine flight phase and
set a 'safe' default value for that phase which will allow
autothrust to be selected.
Informative TextThe Aircraft permission discrete input
validation is described in A9 section TBD.Unchanged
RequirementCSS197-218-2.3The condition 'three throttles at idle
or below' shall be 'true' when the bit is set by both units (A
& B) on any one PRIM.Unchanged
Informative TextThe condition 'Three throttles at idle or below'
shall be transmitted on AFDX by both units (A & B) of each
PRIM.Unchanged
Heading1.6.5 All casesUnchanged
RequirementCSS197-55-2.3Provide a Status message indicating the
status of the validated TRA value and the signal source
selected.UnchangedFor use by client functions which may need to
take account of signal quality and for system testing purposes.
RequirementCSS197-57-2.3Indicate any detected input signal
failures to the maintenance function.UnchangedAll failures are
logged in support of meeting JAR-E-510
RequirementCSS197-70-2.3All confirmation times and tolerances
shall be trimmable via development variable.Unchanged
Heading1.6.6 Non Functional RequirementsUnchanged
RequirementCSS197-72-2.3Accuracy - Transient: The EEC transient
processing accuracy of the TRA signal (i.e. up to a frequency of
1Hz with a maximum slew rate of 35 deg/sec), from EEC input
connector to memory location conditioning, shall be 0.317 degrees
of Arc.Unchanged
RequirementCSS197-74-2.3Accuracy - Steady State: The EEC steady
state processing accuracy of the TRA signal (i.e. over normal range
at a frequency of 0 to 1Hz with a maximum slew rate of 5 deg/sec),
from EEC input connector to memory location conditioning, shall be
0.317 degreesUnchanged
RequirementCSS197-76-2.3Range: The EEC shall accept a transducer
operating range of -180 to 180 degrees resolver angle.Unchanged
RequirementCSS197-219-2.3The working range of the TRA assembly
is -40 to 87.6 deg.Unchanged
RequirementCSS197-78-2.3Performance:TBDUnchanged
RequirementCSS197-80-2.3There shall be no restriction on the
rate of change of TLA.UnchangedThe rate of change of TLA cannot be
used to detect system failures.
RequirementCSS197-82-2.3Reliability: TBD for A380-1Unchanged
Heading1.7 Sub-System RequirementsUnchanged
Heading1.7.1 Transducer/Actuator RequirementsUnchanged
RequirementCSS197-91-2.3NONE, Aircraft Part, Buyer
responsibility.Unchanged
Heading1.7.2 EEC and OS RequirementsUnchanged
Heading1.7.2.1 EEC Physical & Functional DesignUnchanged
RequirementCSS197-94-2.3The EEC shall support two channels of
six wire resolver interface to meet voltage, frequency, impedance
and sensitivity as defined by the Buyer.UnchangedECM AR-1317 -
2.3.1
Informative TextA standard resolver interface has one primary
winding and two secondary windings, One secondary has an output
proportional to the sine of the resolver angle and the other has an
output proportional to the cosine of the resolver
angle.Unchanged
Informative TextThe three TPA signals will be received in each
EEC channel on both of the two existing AFDX busses. No additional
hardware requirement needed here.Unchanged
RequirementCSS197-100-2.3The OS in each channel of the EEC shall
read that channels TRA resolver signals and provide a validated
resolver angle to the AS in units of degrees, and at a rate
compatible with the software schedule.UnchangedFor compatibility
with Application Software.
RequirementCSS197-103-2.3UnchangedECM AR-1317 - 2.3.1
RequirementCSS197-105-2.3The OS in each channel shall provide
the TRA angle to both EEC AS channels'.UnchangedEach AS channel
needs access to both channels signals in order to detect and
accommodate faults.
RequirementCSS197-106-2.3The OS shall provide a status word for
each channels raw data values'.Unchanged
RequirementCSS197-107-2.3The OS shall detect failures of the TRA
signal in each channel and declare them to the AS using the
appropriate Status word for that channel.UnchangedTo help identify
where the fault is located. Indictment of the EEC will give clear
indication that the EEC needs changing. Otherwise there is a good
chance the problem lies with other units, connectors or harnesses,
etc..
Heading1.7.2.2 EEC Non-Functional RequirementsUnchanged
RequirementCSS197-109-2.3Accuracy - Transient: The EEC transient
processing accuracy of the TRA signal (i.e. up to a frequency of
1Hz with a maximum slew rate of 35 deg/sec), from EEC input
connector to memory location conditioning, shall be 19 minutes of
Arc.Unchanged
RequirementCSS197-110-2.3Accuracy - Steady State: The EEC steady
state processing accuracy of the TRA signal (i.e. over normal range
at a frequency of 0 to 1Hz with a maximum slew rate of 5 deg/sec),
from EEC input connector to memory location conditioning, shall be
19 minutes ofUnchanged
RequirementCSS197-111-2.3Range: The EEC shall accept a
transducer operating range of -180 to 180 degrees resolver
angle.Unchanged
RequirementCSS197-220-2.3The normal range of the TRA assembly is
-40 to 87.6 degUnchanged
RequirementCSS197-114-2.3Performance:TBDUnchanged
RequirementCSS197-115-2.3There shall be no restriction on the
rate of change of TLA.UnchangedThe rate of change of TLA cannot be
used to detect system failures.
RequirementCSS197-116-2.3Reliability:TBD for A380-1Unchanged
Heading1.7.3 Application Software RequirementsUnchanged
Heading1.7.3.1 Pre-ConditioningUnchanged
Heading1.7.3.2 Functional BehaviourUnchanged
Heading1.7.3.2.1 TRA Fault DetectionUnchanged
RequirementCSS197-121-2.3Each TRA channel shall be declared
invalid if its value is outside high or low range check limits, or
if identified as invalid by the OS. The EEC shall apply a
confirmation time of dvTRAFltSetInt seconds. The conditions for
signal reheal are defined in CSUnchanged
RequirementCSS197-122-2.3UnchangedThe throttle stand only allow
reverse thrust to be selected on inboard engines.
Informative TextUnchanged
RequirementCSS197-124-2.3A TRA cross check error between two
valid TRA signals shall be confirmed when a difference of
dvTRAXCTol or more is detected between TRAOwnRaw and TRAOthRaw, for
dvTRAXChkInt seconds or longer. Cross checks between the two TRA
signals shall be performed cUnchanged
RequirementCSS197-225-2.3During the cross check fault
confirmation time, TRAV shall be set to last good
value.Unchanged
Heading1.7.3.2.2 TPA ValidationUnchanged
RequirementCSS197-134-2.3Each TPA signal shall be declared
invalid and excluded from the selection if the status from the AFDX
function is not valid. In addition, the PRIM transmits the validity
of each TPA signal through the bits Throttle1 acquisition fault,
Throttle2 acquisiUnchanged
RequirementCSS197-135-2.3UnchangedThe throttle stand only allows
reverse thrust to be selected on inboard engines.
RequirementCSS197-139-2.3If a TPA signal from a PRIM is declared
invalid in the local channel for more than dvTPAFltSetInt seconds,
then the EEC shall use the corresponding value from the other
channel providing that it is valid.Unchanged
RequirementCSS197-224-2.3During the confirmation time, the last
valid value shall be held.Unchanged
RequirementCSS197-142-3.5Each TPA signal shall be confirmed
invalid if the same source is invalid in both channels for at least
dvTPADFltSetInt seconds (Fault Integrator with dvTPAFaultDecrement
seconds down), during which time the last valid value of the
invalidated signal shallUnchangedThis will prevent the signal being
logged as faulty if a short glitch occurs.
RequirementCSS197-143-2.3A confirmed failure of a TPA signal
shall be able to clear (up to three times) if the signal is valid
again for more than dvTPADFltClrInt seconds (non-cumulative time).
After three times the failure shall be latched until the next EEC
resetUnchanged
Heading1.7.3.2.3 TPA Cross ChecksUnchanged
RequirementCSS197-148-2.3For each of the three TPA signals, when
both own and other channel TPA values are valid the own channel
value shall be used for cross-checking purposes.UnchangedMore
reliable and less data skew than other channel.
RequirementCSS197-149-2.3Throttle movement shall be determined
to be in progress if two or more valid TPA signals are changing at
a rate of more than the threshold. If one TPA signal is confirmed
invalid, it shall be treated as not moving.UnchangedTwo valid
signals are required to confirm throttle is moving.
RequirementCSS197-213-2.3The rate of change threshold of
dvTPAMovDet deg/s shall be lowered to dvTPASSDet deg/s when one
valid signal exceeds dvTPAMovDet deg/s; it shall return to
dvTPAMovDet deg/s when all valid signals are moving at a rate of
less than dvTPASSDet deg/s.Unchanged
RequirementCSS197-214-2.3Following throttle movement there shall
be a confirmation period of dvTPAMoveConf seconds before the
movement detection become false.Unchanged
RequirementCSS197-150-2.3If throttle is moving and one TPA
signal (frozen signal) does not move for dvTPAFrozenConf seconds
then that TPA signal shall be failed and excluded from the
selection.UnchangedReject frozen signals from selection.
RequirementCSS197-151-2.3UnchangedDuring throttle there may be
differences due to data skewing.
RequirementCSS197-152-2.3The TPA cross check tolerance shall be
dvTPAXCTol degrees.Unchanged
RequirementCSS197-153-2.3During throttle movement the cross
check tests shall be suspended and the previous result of the cross
check tests shall be retained and used for TPA
selection.Unchanged
RequirementCSS197-154-2.3For each cross check test, failure
shall be confirmed during dvTPAXCConf seconds (non-cumulative time)
prior to setting a fault.Unchanged
RequirementCSS197-155-2.3A confirmed failure shall be able to
clear (up to three times) if the comparison test passes with no
fault for more than one second (non-cumulative time). After three
times, the failure shall be latched until the next EEC
reset.Unchanged
RequirementCSS197-166-2.3To avoid a thrust transient, the reheal
of TPA signals (following invalidity only) shall only occur when
the incriminated signal is in agreement (tolerance dvTRATPAXCTol)
with the selected TRA.Unchanged
Heading1.7.3.2.4 TPA SelectionUnchanged
RequirementCSS197-158-2.3If all three cross checks are valid the
validated TPA value shall be calculated as the average of the three
TPA signals.Unchanged
RequirementCSS197-159-2.3If only two cross checks are valid the
validated TPA value shall be set to the value of the TPA signal
which is common to the two valid cross checks.Unchanged
RequirementCSS197-160-2.3If one cross check is valid, then the
validated TPA value shall be set to the average of the two TPA
values in that test.Unchanged
RequirementCSS197-163-2.3If, following validity checks and cross
checks, at least 2 TPA signals are not valid and in agreement, then
set TPA to Forward Idle and declare it invalid.Unchanged
RequirementCSS197-164-2.3During confirmation of a TPA failure
(Invalidity or cross check failure), the EEC shall use the last
valid selection of TPA.Unchanged
RequirementCSS197-167-2.3A dedicated development variable trim
shall be provided to allow the validity of selected TPA to be set
to invalid.UnchangedAirbus Requirement
RequirementCSS197-170-2.3TRA validated (TRAV) shall be set as
defined below:Unchanged
RequirementCSS197-171-3.3For detected failures TRA Validated
(TRAV) shall be selected as follows:Unchanged
Informative TextUnchanged
Informative TextUnchanged
RequirementCSS197-175-2.3When indicating a Faulty LRU to
maintenance, the method used to detect the fault shall be
indicated.UnchangedTo support identification of failed LRU.
RequirementCSS197-176-2.3If the EEC is performing dual channel
TRA fault accommodation, when one or both channels TRA become valid
again, the EEC shall confirm the validity of the TRA signal for
dvTRADFClrInt seconds before selecting the valid TRA.UnchangedTo
prevent frequent selection of accommodation when intermittent
faults occur.
RequirementCSS197-179-2.3A confirmed failure of a TRA signal
(either invalidity or disagreement) shall be able to reheal upto
three times when for the incriminated signal: no fault is detected
and its' value lies within dvTRAXCTol degrees of TRAV, for more
than dvTRAFltClrInt secUnchangedLatch intermittent signals out of
selection.
RequirementCSS197-180-2.3For each TRA signal, after confirming
and clearing a failure three times, any further failure shall be
latched until the next EEC reset.Unchanged
RequirementCSS197-181-2.3The TRA selection and accommodation
logic shall generate a selection code word (TRASELMOD) that will
identify the selected TRA signal and how it was
selected.Unchanged
RequirementCSS197-228-2.3Unchanged
Heading1.7.3.3 Anomalous BehaviourUnchanged
Informative TextNoneUnchanged
Heading1.7.3.4 Scheduling RequirementsUnchanged
RequirementCSS197-193-2.3TRA Iteration Rate shall be at least
once every 50 ms. in all operating modes.UnchangedTo support
fastest rate requirement of internal customers of the input
data.
Sheet2
MBD0005FA6E.doc
Channel A
Channel B
Channel B
Channel A
Channel B
TPA-3
TPA-2
TPA-1
Resolver Signals
Channel A
PRIM 3
PRIM 2
PRIM 1
AFDX Network
(Digital Signals)
Channel B
Channel A
EEC
TPA-3
TPA-2
TRA Channel B
TRA Channel A
TPA-1
MBD0005FB48.doc
Selection Requirements
Condition
Actions
Rationale
Selection 1 - No Fault
V: Average of own and other signals
VS: Valid
CS: No Fault
Using the average improves accuracy.
Selection 2
Fault Confirmation:
CT: Trimable {1s up 150s down Fault Integrator}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: TRA own
VS: Degraded
CS: Indicate Faulty LRU to maintenance
Select TRA own
Selection 3
Fault Confirmation:
CT: Trimable {1s up 150s down Fault Integrator}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: TRA other
VS: Degraded
CS: Indicate Faulty LRU to maintenance
Select TRA other
Selection 4
Fault Confirmation:
CT: Trimable {1s up 150s down Fault Integrator}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: Reverse Idle
VS: Invalid
CS: Indicate Faulty LRU to maintenance
Select Default based on last good value when all signals are not
available.
Selection 5
Fault Confirmation:
CT: Trimable {1s up 150s down Fault Integrator }
V: Last Good Value
VS: Degraded
Confirmed Fault
V: Forward Idle
VS: Invalid
CS: Indicate Faulty LRU to maintenance
Select Default based on last good value when all signals are
invalid.
Selection 6
Fault Confirmation:
CT: Trimable {1s up 150s down Fault Integrator}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: TRA Own
VS: Degraded
CS: Indicate Faulty LRU to maintenance
Select remaining valid signal.
Selection 7
Fault Confirmation:
CT: Trimable {1s up 150s down Fault Integrator}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: TRA Other
VS: Degraded
CS: Indicate Faulty LRU to maintenance
Select remaining valid signal.
Selection 8
Fault Confirmation:
CT: Trimable {1s up 150s down Fault Integrator}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: Forward Idle
VS: Degraded
CS: Indicate Faulty LRU to maintenance
Select default value when only one source is valid and this
source is in disagreement with the aircraft orders.
Selection 9
Fault Confirmation:
CT: Trimable {1s up 150s down Fault Integrator}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: TPA
VS: Degraded
CS: Indicate Faulty LRU to maintenance
Select available signal to retain control.
MBD0005FB69.doc
Selection 10
Fault Confirmation:
CT: Trimable {1s up 150s down Fault Integrator}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: Forward Idle
VS: Invalid
CS: Indicate Faulty LRU to maintenance
Select default value when only one source is valid and this
source is in disagreement with the aircraft orders.
Selection 11
Fault Confirmation:
CT: Trimable {1s up 150s down Fault Integrator}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: TRA Own
VS: Degraded
CS: Indicate Faulty LRU to maintenance
Select remaining valid signal.
Selection 12
Fault Confirmation:
CT: Trimable {1s up 150s down Fault Integrator} V: Last Good
Value
VS: Degraded
Confirmed Fault
V: TRA Other
VS: Degraded
CS: Indicate Faulty LRU to maintenance
Select remaining valid signal.
Selection 13
Fault Confirmation:
CT: Trimable {1s cumulative}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: Forward Idle
VS: Invalid
CS: Indicate Faulty LRU to maintenance
Select default value when only one source is valid and this
source is in disagreement with the aircraft orders.
Selection 14
Fault Confirmation:
CT: Trimable {1s cumulative}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: TPA
VS: Degraded
CS: Indicate Faulty LRU to maintenance
Select remaining valid signal..
Selection 15
Fault Confirmation:
CT: Trimable {1s cumulative}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: Reverse Idle
VS: Invalid
CS: Indicate Faulty LRU to maintenance
Select Default based on last good value when all signals are not
available.
Selection 16
Fault Confirmation:
CT: Trimable {1s cumulative}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: MCL detent point
VS: Invalid
CS: Indicate Faulty LRU to maintenance
Select Default based on Mach number when all signals are
invalid.
Selection 17
Fault Confirmation:
CT: Trimable {1s cumulative}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: Last Good Value
VS: Invalid
CS: Indicate Faulty LRU to maintenance
Select Default based on Mach number when all signals are
invalid.
Selection 18
Fault Confirmation:
CT: Trimable {1s cumulative}
V: Last Good Value
VS: Degraded
Confirmed Fault
V: Forward Idle
VS: Invalid
CS: Indicate Faulty LRU to maintenance
Select Default based on Mach number when all signals are
invalid.
MBD0005FB3A.vsd
MBD0005FA62.vsd
MBD0005FA6C.vsd
