Fault Isolation for the Slow Acceleration to Idle on Engine 1(2)

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1. Possible Causes
· PUMP-HP/LP FUEL ( 2001EM )
· VALVE-LP FUEL, ENG 1 ( 12QM )
· VALVE-LP FUEL, ENG 2 ( 13QM )
· FMU ( 4000KC )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 28-24-00-710-002 Operational Test of the ENG 1(2) LP Fuel Valve
Ref. AMM 28-24-00-720-001 Functional Test of the LP Fuel Shut Off Valves
Ref. AMM 71-00-00-710-022 Test No.6 : ELectronic Engine Control (EEC) System Idle Test
Ref. AMM 72-00-00-200-012 Borescope Inspection of the LP Turbine
Ref. AMM 72-00-00-200-013 Borescope Inspection of inside of Combustion Chamber and HP turbine
stage 1 Vanes
Ref. AMM 72-00-00-200-014 Borescope Inspection of the Stage 1 High Pressure Turbine (HPT)
Blades and Duct Segments
Ref. AMM 72-00-00-200-015 Borescope Inspection of the Stage 2 HPT Blades and Duct Segments
REFERENCE DESIGNATION
Ref. AMM 72-00-00-200-016 Inspection of the HP Compressor
Ref. AMM 72-00-00-210-012 Inspection of the HP Compressor Stage 3 Rotor Clapper
Ref. AMM 72-32-60-200-011 Inspection of the LPC Bleed Duct Seal
Ref. AMM 72-40-00-200-010 General Visual Inspection of Fuel Nozzle Attachment Area
Ref. AMM 72-50-00-200-010 Inspection of the Turbine Exhaust Case
Ref. AMM 72-60-29-200-010 General Visual Inspection of the Deoiler Gear and Impeller Assembly
Ref. AMM 73-11-48-200-010 General Check of the Power Plant Flexible Fuel Tubes
Ref. AMM 73-12-41-000-010 Removal of the Low Pressure (LP)/High Pressure (HP) Fuel Pump
Ref. AMM 73-12-41-400-010 Installation of the Low Pressure (LP)/High Pressure (HP) Fuel Pump
Ref. AMM 73-13-42-720-010 Functional Test of the Fuel Recirculation Cooling System without Barfield
Tester and without AIDS
Ref. AMM 73-22-52-000-010 Removal of the Fuel Metering Unit (FMU)
Ref. AMM 73-22-52-400-010 Installation of the Fuel Metering Unit (FMU)
Ref. AMM 75-32-52-700-011 Functional Test of the HPC Stage 7 Bleed Valve with Test Set
IAE2R19437
Ref. AMM 75-32-54-700-011 Functional Test of the HPC Stage 10 Bleed Valve with Test Set
IAE2R19437
3. Fault Confirmation
Subtask 73-00-00-860-207-A
A. Not applicable, the fault is evident.
4. Fault Isolation
Subtask 73-00-00-810-286-A
A. If the fault symptom is identified by the crew observation: slow acceleration to idle after light off:
(1) Do a check of the engine inlet and exhaust areas for damage.
(2) Do a check for aircraft bleed system malfunction (pack valve/engine air intake anti-ice/wing anti-ice/
bleed leakage).
(3) Do a check of the PS3 line to make sure that there is no blockage or leakage.
(4) Do a check of the LPC bleed duct seal Ref. AMM 72-32-60-200-011 .
(5) Do a functional test of the HPC stage 7 and 10 bleed valves Ref. AMM 75-32-52-700-011 and Ref.
AMM 75-32-54-700-011 .
(6) Remove and replace the Low Pressure (LP) and High Pressure (HP) fuel pump PUMP-HP/LP
FUEL ( 2001EM ) Ref. AMM 73-12-41-000-010 and Ref. AMM 73-12-41-400-010 .
(7) Do a general visual inspection of the deoiler gear and impeller assembly Ref.
AMM 72-60-29-200-010 .
(8) Do an operational test and functional test of the LP fuel shut-off valves and their controls VALVE-LP
FUEL, ENG 1 ( 12QM ) and VALVE-LP FUEL, ENG 2 ( 13QM ) Ref. AMM 28-24-00-710-002 and
Ref. AMM 28-24-00-720-001 .
(9) Do a borescope inspection of the HP compressor and an inspection of the HPC stage 3 rotor clapper
Ref. AMM 72-00-00-200-016 and Ref. AMM 72-00-00-210-012 .
(10) Do a borescope inspection of the combustion chamber, HPT stage 1 vanes and a general
visual inspection of fuel nozzle attachment area ambers Ref. AMM 72-00-00-200-013 and Ref.
AMM 72-40-00-200-010 .
(11) Do a borescope inspection of the HPT stage 1 and stage 2 blades and duct segment Ref.
AMM 72-00-00-200-014 and Ref. AMM 72-00-00-200-015 .
(12) Do a borescope inspection of the Low Pressure Turbine (LPT) and Turbine Exhaust Case (TEC) Ref.
AMM 72-00-00-200-012 and Ref. AMM 72-50-00-200-010 .
(13) Do a functional test of the fuel recirculation cooling system and general check of the power plant
flexible fuel tubes Ref. AMM 73-13-42-720-010 and Ref. AMM 73-11-48-200-010 .
(14) Remove and replace the FMU ( 4000KC ) Ref. AMM 73-22-52-000-010 and Ref.
AMM 73-22-52-400-010 .
Subtask 73-00-00-710-372-A
B. Do a minimum idle check Ref. AMM 71-00-00-710-022 .
Figure 73(IAE)-00-00-991-00200-13-B- / SHEET 1/1 - Fuel Shut-Off Valve
Figure 73(IAE)-00-00-991-00300-13-A- / SHEET 1/1 - Fuel Diverter and Return Valve
Figure 73(IAE)-00-00-991-00400-13-A- / SHEET 1/1 - Failure of the Fuel Diverter and Return Valve on Engine 1 (2)
Figure 73(IAE)-00-00-991-02600-13-A- / SHEET 1/1 - Relay Box on Engine 1(2)
Figure 73(IAE)-00-00-991-00700-13-A- / SHEET 1/1 - Failure of the Relay Box on Engine 1(2)
Figure 73(IAE)-00-00-991-02200-13-A- / SHEET 1/1 - Failure of the HPC Stage 7 Solenoid Valve on Engine 2
Figure 73(IAE)-00-00-991-02500-13-A- / SHEET 1/1 - Failure of the HPC Stage 7 Solenoid Valve on Engine 2
Figure 73(IAE)-00-00-991-00800-13-B- / SHEET 1/1 - Fuel Control
Figure 73(IAE)-00-00-991-01200-13-A- / SHEET 1/1 - Failure of the HPC Stage 7 Solenoid Valve on Engine 1
Figure 73(IAE)-00-00-991-01300-13-A- / SHEET 1/1 - Failure of the HPC Stage 7 Solenoid Valve on Engine 1
Figure 73(IAE)-00-00-991-01400-13-A- / SHEET 1/1 - Failure of the HPC Stage 7 Solenoid Valve
Figure 73(IAE)-00-00-991-02100-13-A- / SHEET 1/1 - HPC Stage 7 Solenoid Valve on Engine 1
Figure 73(IAE)-00-00-991-01500-13-A- / SHEET 1/1 - Failure of the HPC Stage 10 Bleed Solenoid Valve on
Engine 1(2)
Figure 73(IAE)-00-00-991-01700-13-A- / SHEET 1/1 - Aircraft 28 Volt Supply (Engine 1)
Figure 73(IAE)-00-00-991-01800-13-A- / SHEET 1/1 - Aircraft 28 Volt supply (Engine 2)
Figure 73(IAE)-00-00-991-02300-13-A- / SHEET 1/1 - HPC Stage 7 Solenoid Valve on Engine 2
Figure 73(IAE)-00-00-991-02900-13-A- / SHEET 1/1 - HPC Stage 10 Bleed Solenoid Valve on Engine 1(2)
73-00-00 PB 301 CONF 13 - ENGINE FUEL AND
CONTROL - GENERAL - TASK SUPPORTING DATA
1. Fault Acronym Description
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ACRONYM FAULT DESCRIPTION
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A28VFA Aircraft 28V power failed. This fault code is set if the aircraft
power bus voltage decreases below a specified minimum value for
longer than a specified time.
A28VFI Aircraft 28V power failed. This fault code is set if the aircraft
power bus voltage decreases below a specified minimum value for
longer than a specified time in channel control.
ACIL AC interface Fault Latched. This fault is set due to either an S
out of range failure or a failed end-of-conversion of any of the
following signals: AC Gain, AC Offset, A/D test signal.
ACPSFL Aircraft Permission Switch Failed Closed Flag. This fault code is
set if logic identifies a failure of the permission switch in the
closed position.
ACTMNF Activity monitor Self-Test failure. To do a test of the operation
of the activity monitor circuit, logic commands an Activity Monitor
time-out and examines the WF torque motor. The WF torque motor
current must go to zero after the activity monitor is triggered.
The outputs of that channel are turned off when the activity
monitor times-out.
ADIL A/D Interface Fault: Logic examines a fixed voltage in each A/D
multiplexer. The test voltages are used only for this test.
AIVL AIV Input Failed: Logic compares the local and crosslink feedback
signals of the AIV LVDT to each other and to a synthesised value.
This fault code is set if these signals are different from each
other by more than a specified value.
AIVTK AIV Track Check Failure: This fault is set if the sensed position
of the device does not agree with the commanded position.
AIVWAF AIV Torque Motor Wraparound Failed: Logic changes the ACC
torque-motor-current feedback-voltage to a digital torque motor
current value. This fault code is set if the feedback voltage is
out of range check limits or the comparison identifies a failure.
AIVXCF AIV FeedbacK Cross-Check Failed: This fault code is set if the
local and crosslink feedback values for the AIV LVDT do not agree
for more than a specified period.
ALNAI Altitude not available in channel control. Fault set if local Pamb
reading is failed or local Pamb interface failed and remote Pamb
reading is failed.
ALTCRF Alternator Circuit Failed: Logic examines the alternator health
discrete and the N2 speed. This fault code is set if logic detects
insufficient alternator power output.
ARMFVO Thrust Reverser Arming Valve Failed Open: Fault is set when both
arming solenoids indicate high pressure, the shut off valve is
installed, the reverser command has transitioned (to not
commanded) more than three seconds ago and the shut off valve test
is not complete or is not running.
ARMLNS ARMLNS Reverser Pressurised but Not Commanded Flag Latched with No
Thrust Reverser Shut off Valve. This flag is set when both arming
solenoids discrete indicate pressurised and reverser stow/lock
discrete indicates locked but calculated Throttle Resolver Angle
is in the forward region and the Thrust Reverser shut off valve is
not installed.
ARMLSI Reverser Pressurised but Not Commanded Flag Latched with Thrust
Reverser Shut off valve installed. This flag is set when both
arming solenoid discretes indicate pressurised and the reverser
stow/lock discrete locked, but calculated Throttle Resolver Angle
is in the forward region and the Thrust Reverser shut off valve is
installed.
ARMOFN Deploy Command and both arming discrete indicate Low Pressure with
No Thrust Reverser Shut off Valve. This flag is set when both
reverser arming discretes are set, the engine is not below idle
and the reverser deploy is commanded for a specified period of
time, and the thrust Reverser Shut Off Valve is not installed.
ARMOFS Deploy Commanded and Both arming discretes indicate Low Pressure
with Thrust Reverser Shut Off valve installed. This Flag is set
when both reverser arming discretes are set, the engine is not
below idle and the reverser deploy is commanded for a specified
period of time, and Thrust Reverser Shut Off Valve is installed.
ARMVFO Thrust Reverser Arming Valve failed Open: Fault is set when both
arming solenoids indicate high pressure, the shut off valve is
installed, the reverser command has transitioned (to not
commanded) more than three seconds ago and the shut off valve test
is not complete or is not running.
ARMWAF Reverser Arming Wraparound Failed: Logic compares the state of the
wraparound discrete to the state of the commanded device. This
fault code is set if the position of the device does not agree
with the wraparound discrete.
ARMXCF Arming solenoid Position Cross Check Failed: This fault code is
set if the local and crosslink feedback discrete for the Arming
Solenoid position do not agree for more than a specified time
period.
ARMXCW Reverser Arming Valve Pressure Switch Cross-Check on Ground: Fault
is set when local and Remote Arming solenoid positions disagree
while on the ground.
ASGFSA Autostart Group Failed-Safe Flag for ARINC. This flag is set if
channel in control detects one of the following: An overcurrent in
the Auto-start group; Auto-start hi side failed open; any latched
wraparound fault in the Auto-start group.
ASGILF Autostart Group Solenoid and Relay Current Sense Fault: This fault
is set if the Autostart Group Solenoids/relays use too much
current. A hardware failure or a lightning strike can cause an
overcurrent condition.
AUTORD AUTORD Automatic Redeploy Indicator for Thrust Reverser. Flag
indicates that the reverser is being commanded on and although the
selected reverser feedback previously indicated deployment of
greater than 97 %, indicates deployment less than 90 %.
AUTRS Automatic Restow of the Thrust Reverser on the channel in control.
Flag set when reverser is being commanded off and the selected
reverser feedback previously indicated deployment less than 3 % but
now indicates greater than 10 % deployment.
AVCLTF Air Valve Closed Test Failed: Logic drive AIV valve to the closed
position. This fault code is set if the actual position does not
agree with the commanded position.
AVOPTF Air Valve Open Test Failed: Logic drives the AIV valve to the open
position. This fault code is set if the actual position does not
agree with commanded position.
B10WAF 10th Stage Bleed Valve Wraparound Failed: Logic compares the state
of the wraparound discrete to the state of the commanded device.
This fault code is set if the position of the device does not
agree with wraparound discrete.
B1SWAF B1S(10th Stage Bleed) Wraparound Failed: Logic compares the state
of the wraparound discrete to the state of the commanded device.
This fault code is set if the position of the device does not
agree with the wraparound discrete.
B1SWAI Tenth Stage service bleed wraparound fault. This fault code is set
when the 10th stage bleed wraparound in the channel in control
does not agree with the commanded torque motor current for more
than 0.2 seconds.
B25L B25 Input Failed: Logic compares the local and crosslink feeback
signals of the 2.5 bleed LVDT to each other and to a synthesised
value. This fault code is set if these signals are different from
each other by more than a specified time.
B25TK B2.5 Track Check Failure. This fault is set if the sensed position
of the device does not agree with the commanded position.
B25WAF B25 Torque Motor Wraparound Failed: Logic changes the bleed 2.5
torque-motor-current feedback-voltage to a digital torque motor
current value. This value is compared to the commanded torque
motor current. This fault code is set if the feedback voltage is
out of range check limits or the comparison identifies a failure.
B25XCF B25 Feedback Cross Check Failed: This fault code is set if the
local and crosslink feedback values for the 2.5 bleed LVDT do not
agree for more than a specified time period.
B7AWAF 7th Stage Bleed 1 Wraparound Failed: Logic compares the state of
the wraparound discrete to the state of the commanded device. This
fault code is set if the position of the device does not agree
with the wraparound discrete.
B7BWAF 7th stage Bleed 2 Wraparound Failed: Logic compares the state of
the wraparound discrete to the state of the commanded device. This
fault code is set if the position of the device does not agree
with the wraparound discrete.
B7DWAF 7th Stage Bleed Wraparound Failed: Logic compares the state of the
wraparound discrete to the state of the commanded device. This
fault code is set if the position of the device does not agree
with the wraparound discrete.
BGFAIL Background Software Execution Failure: Logic examines the status
of two flags to make a check of background operation. This fault
code is set if both flags are not set.
DCVWAF Reverser DCV Wraparound Failed: Logic compares the state of the
wraparound discrete to the state of the commanded device. The
fault code is set if the position of the device does not agree
with the wraparound discrete.
DEMFLI Data Entry Modifier Failure: Flag set when channel in control and
no Data Entry Modifier sources have been valid for past 5 seconds
after POR.
DEPNC Date Entry Plug Not Connected: Logic examines the states of all
the DEP discrete. This fault code is set if all of the discrete
have the same logic level (plug not connected).
DEPNG Invalid Data Entry Plug: This fault code is set for one or more of
these conditions; invalid serial number combination; invalid data
entry modifier combination; invalid EPR modifier bits; invalid 2.5
bleed hardware schedule input or invalid T5 bias level selector.
DISCFL Instinctive Disconnect Latched Failed: Logic compares local and
crosscheck feedback signals to each other. This fault code is set
if these values are different by more than a specified value.
DM1IF Discrete 1 Interface Failure: Logic examines the condition of
the Discrete Multiplexer 1. Logic uses a known internal discrete
test signal to examine the multiplexer input of that signal. After
each part of the test, logic switches the test between true and
false logic to detect both failure modes.
DM2IF Discrete MU 2 Interface Failure: Logic examines discrete
Multiplexer 2. Logic uses a known internal discrete test signal to
examine the multiplexer input of that signal. After each part of
the test, logic switches the test between true and false logic to
detect both failure modes.
DM3IF Discrete MU 3 Interface Failure: Logic examines discrete
Multiplexer 2. Logic uses a known internal discrete test signal to
examine the multiplexer input of that signal. After each part of
the test, logic switches the test between true and false logic to
detect both failure modes.
DN1XCF Autothrust Disconnect 1 Cross check Failed: This Fault code is
set if the Autothrust Disconnect 1 local and crosslink feedback
discretes do not agree for more than a specified time period.
DN2XCF Autothrust Disconnect 2 Cross check Failed: This fault code is
set if the Autothrust Disconnect 2 local and crosslink feedback
discrete do not agree for more than a specified time period.
DPFLT Double Precision Fault: Fault is set when the hardware multiply
and divide instruction test fails.
DPWRF Hardware Depower Failure: Logic reads a bit in the hardware
depower status word to verify a correct channel depower
indication. This fault code is set if the status word bit
identifies the channel is depowered.
EEMDNG EEPROM Miscellaneous Counter/Storage Area Failure: Logic examines
the condition of the data in the EEPROM counters. This fault code
is set if each set of counters has values different by more than
one count.
EG1ILF Engine Group 1 Solenoid Current Sense Fault: This fault code is
set if the Engine Group 1 solenoids use too much current. A
hardware failure or a lightning strike can cause overcurrent
condition.
EG2ILF Engine Group 2 Solenoid Current Sense Fault: This fault code is
set if the Engine Group 2 solenoids use too much current. A
hardware failure or a lightning strike can cause overcurrent
condition.
EIUFLI Engine Interface Unit (EIU) Failure in channel in Control: Fault
is set if channel in control and one of the following exists, no
EIU lables are recieved for 13 seconds. Master Level Indication
failure, failure of the rotary switch, EIU word 2 (OL 031) is
not available.
EIUNG EIU Latched Failed: Logic examines the condition of an ARINC word
received from the serial data interface with parity and range
checks. Logic also examines the status of the wraparound test.
Logic also detects lack-of-data and intermittent data conditions.
EMWVF EEPROM Write Verify Failure: logic examines each EEPROM location
with an ERASE-WRITE-VERIFY test. A failure of any location sets
this fault code.
ENGDIS Engine Position Discretes Disagree: This fault code is set if the
Engine Position local and crosslink feedback discretes do not
agree for more than a specified time period.
ENGNG Engine Position Indicator Failed: This fault code is set if the
Engine Position Local and crosslink feedback discretes do not
agree for more than a specified time period.
ENLXCF Left Engine Cross Check Failed: This fault code is set if the
left engine local and crosslink feedback discretes do not agree
for more than a specified time period.
ENRXCF Right Engine Cross Check Failed: This fault code is set if the
left engine local and crosslink feedback discretes do not agree
for more than a specified time period.
ERMPOR EEPROM Parity Error Caused By Reset: Logic examines all pages of
EEPROM with a checksum test. This test is done during POR routine
and in the background during execution of the control program.
EPRINI P5 Failed in Channel in Control: Set due to the presence of any
of the following conditions, P5 EEROM checksum failure, SCPS
temperature frequency failed end-of-conversion, SCPS reference
frequency failed end-of-conversion, SCPS temperature F/D tooth or
period counts failed range check, SCPS reference F/D tooth or
period counts failed range check or SCPS temperature versus
reference check failed.
EPRMDI EPR Modifier failed in Channel in Control: Flag set when channel
in control, engine in run mode, the EPR modifier is not validated
and one of the following is true, local or remote DEM interface
fault, EPR modifier parity error detected, discrete word 1
interface failed.
ESOST Spool Up Overspeed Test Started Above Idle: Flag set when the
spool-up overspeed test in progress and N1 and N2 overspeed
circuit in test mode.
EXIL Excitation Interface Fault Latched: This fault is set if a
failure of any of the following occurs, AC Excitation, AC Test,
AC Drift signal or A/D Test signal.
EXRSTF Fault Bit for Channels Disagree on External Reset or Channel
Select: This fault code is set if the local and crosslink channel
reset lines or channel select lines do not agree during a
specified time period.
FDVFL Fuel Diverter Valve Failed: Logic compares the solenoid wraparound
discrete of the Fuel Diverter Valve to the switch command. This
fault code is set if the actual position does not agree with the
commanded position or the solenoid cannot be failsafed.
FDVWAF Fuel Diverter Valve Wraparound Failed: Logic compares the state of
the wraparound discrete to the state of the commanded device. This
fault code is set if the position of the device does not agree
with the wraparound discrete.
FDVWAI Fuel Diverter Wraparound Fault in Channel in Control: Fault is set
when channel is in control and a failure of the Fuel Diverter
Valve Solenoid Wraparound is failed for one major cycle.
FDVXCF Fuel Diverter Valve Position Cross Check Failed: This fault code
is set if the Fuel Diverter Valve local and crosslink feedback
discretes do not agree for more than a specified time period.
FFIL Fuel Flow Interface fault: Logic examines the operation of the WF
meter pulse count logic. This fault code is set if the pulse count
is not correct.
FFL Fuel Flow Input Failed: Logic compares the local and crosslink
feedback signals to the WF resolver to each other and to a
synthesised value. This fault code is set if these signals are
different from each other by more than a specified value.
FGFAIL Foreground Software Execution Failure: Logic examines the
foreground software to see if it executes at every timing
interrupt.
FLIP Flip mode set: This fault code is set if the IDG temperature of
the heat management system goes above a specified value.
FMBIG FMU Fuel Flow is Too Big for Aircraft: This fault is only
applicable to A319 and A320 aircraft and is set during Menu Mode
in the Fuel Metering Unit test when the fuel valve indicates flow
greater than 14400 PPH.
FMSMAL FMU Fuel Flow is Too Small for Aircraft: This fault is only
applicable to A321 aircraft and is set during Menu Mode in Fuel
Metering Unit test when the fuel valve indicates less than 14400
PPH.
FUELDP Fuel depulse activated. This flag is set if the aircraft is on
ground, an autostart is in progress but run mode is not enabled,
and one of the following is detected: an engine surge, hot start
fuel depulse or hung start for the depulse.
GND3FL At Least Three ground indications Failed.
HCCIL HCC Feedback Interface Latched Failure: Fault set when failure of
local Active Clearance control interface is detected.
HCCL HCC Sense failed: Logic compares the local and crosslink feedback
signals of the HCC LVDT to each other and to a synthesised value.
This fault code is set if these signals are different from each
other by more than a specified value.
HCCTK ACC Track Check Failure: This fault is set if the sensed position
of the device does not agree with commanded position.
HCCWAF ACC Torque Motor Wraparound Failed: Logic changes the ACC
torque-motor-current-feedback-voltage to a digital torque motor
current value. This value is compared to the commanded torque
motor current. This fault code is set if the feedback voltage is
out of range check limits or the Comparison identifies a failure.
HCCXCF HCC(ACC) Feedback Cross Check Failed: This fault code is set if
the HCC local and crosslink feedback values do not agree for more
than a specified time period.
HMFAIL Heat Management System Failure: This fault indicates to the pilot
that the heat management system has failed and action on his/her
part is required.
HMSIL Heat Management System Interface Latched Failure: This fault code
is set when there is a failure of the range check of the CJC A/D
counts.
HMWARN Heat Management System Warning: This fault is set upon first
indication of spill over-temp or fuel temp failure. The fault is
cleared when the HMFAIL is set.
HOTSTI Hot Start Channel in Control: This fault is set when the channel
in control, the light off delta has been reached and T5 exceeds
the detection threshold.
HUNGI Hung Start in Channel in Control: This fault is set when the
channel in control and a hung start is detected.
IGAFAI Ignitor A Failure in Channel in Control: Fault is set if channel
in control, igniter A is energised and a No light off condition is
detected.
IGAWAF Ignition Relay 1 Wraparound Failed: Logic compares the state of
the wraparound discrete to the state of the commanded device. This
fault code is set if the position of the device does not agree
with wraparound discrete.
IGBFAI Ignitor B Failure in Channel in Control: Fault is set if channel
in control, igniter B is energised and a No light off condition is
detected.
IGBWAF Ignition Relay 2 Wraparound Failed: Logic compares the state of
the wraparound discrete to the state of the commanded device. This
fault code is set if the position of the device does not agree
with wraparound discrete.
INTIPF Interrupt In Progress Test failure: This test examines the
interrupt-in-progress flags to verify that interrupts do not
occur. This fault is set if the flag was not set at the start of
an interupt.
INTRF Interrupt Return Test Failure: Logic examines the return address
of a completed interrupt routine to see if the return address is
correct. This fault code is set if the return address is not
correct.
ITF Instruction Test Failure: Logic examines the functions of the
EEC-150-20 processor instruction set. Logic examines the simple
functions first. Logic then uses these to examine the more
complicated instructions. A failure sets this fault code.
LADCNG Left ADIR Link Failure: Logic examines the condition of an ARINC
word received from the serial data interface with parity and range
checks. Logic also examines the status of the wraparound test.
Logic also detects lack-of data and intermittent data conditions.
LOADIS Disagreement of Hardware Loss of Activity Monitors: Set when the
hardware 0 Ring of the INCOM and OUTCOM Loss-of-Activity status
bits do not logically equate to the Loss-of-Activity indication
given by INA412, bit 14.
LOAIN Loss of Activity Monitor (INCOM) Failure: Set due to a failure of
the loss of Activity monitor within the INCOM FPGA.
LOAOUT Loss of Activity Monitor (OUTCOM) Failure: Set due to the Loss of
Activity monitor within the OUTCOM FPGA.
LOATF Loss of Activity Test Failed: Logic causes a Loss-of-Activity
failure to examine the condition of the loss-of-activity test.
This fault is set if a bit in the hardware status word is not set
after the LOA failure.
LOCPOR Loss of Clock Caused Reset: Logic examines the operation of the
system clock. The test is part of the POR routine.
LOCTF Loss of Clock Test Failed: Logic stops the clock to examine the
condition of the loss of Clock Test. This fault code is set if the
loss-of-clock condition is not detected in a specific time period.
N1IFA N1 Interface Failure: A Flag is set when an N1 interface fault is
latched by a range/rate test or when the resolver/LVDT excitation
signal fails its self test.
N1L N1 Input Latched: Logic examines the condition of the N1 signal
with range and rate checks.
N1LKI Locked N1 Rotor in channel in Control: Fault is set when the
channel is in control, N2 is greater than 5000 rpm, N1 is valid
and Start Mode is either Auto Start or Manual Start.
N10SDT N1 Overspeed Test Trip Point Found to be Incorrect During Spool
Down Overspeed test: During the Overspeed Spool Down test, the N1
overspeed trip point was determined to be failed.
N10VL N1 Overlimit: Flag set when the selected N1 signal is at redline
(greater than 14950 rpm).
N1XCF N1 Crosscheck Latched Failure: Fault set when the local and remote
N1 signals are valid but differ by more than 60 rpm for one
second.
N2IFA N2 Interface Failure: A Flag is set when N2 interface fault is
latched by a range/rate test or when the resolver/LVDT excitation
signal fails its self test.
N2L N2 Input Latched: Logic examines the condition of the N2 signal
range and rate checks.
N20SDT N2 Overspeed Test Trip Point Found to be Incorrect During Spool
Down Overspeed Test: During the overspeed Spool Down test, the N2
overspeed trip point was determined to be failed.
N20VL N2 Overlimit: This Flag set when the selected N2 signal is at the
redline (greater than 14950 rpm).
N2XCF N2 Cross Check Failed: This fault code is set if the local
crosslink feedback values for N2 do not agree for more than a
specified time period.
OBABLD Thrust Overboost Detected: Flag is set when all bleeds required
based on inlet temp reading and 2.5 Bleed Command.
OBIBLD Thrust Overboost Detected: Flag is set when the intermediate bleed
required based on inlet temp and 2.5 Bleed Command.
OBMBLD Thrust Overboost Detected: Flag is set when the minimum bleed
required based on inlet temp reading and 2.5 Bleed Command.
OBNBLD Thrust Overboost Detected: Flag is set when no bleed required
based on inlet temp reading and 2.5 Bleed Command.
OCLNW1 Overspeed Current Sense Not Working: When the channel starts
operation after POR, Logic reads a status word that identifies the
condition of the Overspeed overcurrent detection circuit. This
fault code is set if the circuit is defective.
OCLNW2 Engine Group 1 Current Sense Not Working: When The channel starts
operation after POR, logic reads a status word that identifies the
condition of the Engine Group 1 overcurrent circuit. This fault
code is set if the circuit is defective.
OCLNW3 Engine Group 2 Current Sense Not Working: When The channel starts
operation after POR, logic reads a status word that identifies the
condition of the Engine Group 2 overcurrent circuit. This fault
code is set if the circuit is defective.
OCLNW4 Health Relay Current Sense Not Working: When the channel starts
operation after POR, logic reads a status word that identifies the
condition of the Health relay Driver Overcurrent detection
circuit. This fault code is set if the circuit is defective.
OCLNW5 Autostart Current Sense Not Working: When the channel starts
operation after a POR, logic reads a status word that identifies
the condition of the Autostart Group overcurrent detection
circuit. This fault code is set if the circuit is defective.
OCLNW6 WF On/Off Current Sense Not Working: When the channel starts
operation after POR, logic reads a status word that identifies the
condition of the WF Solenoid Driver overcurrent detection circuit.
This fault is set if the circuit is defective.
OCLNW7 Reverser Group Current Sense Not Working: When the channel starts
operation after POR, logic reads a status word that identifies the
condition of the reverser group overcurrent detection circuit.
This fault is set if the circuit is defective.
ODISCF Overspeed System Fail Due to A1/A5 Harness Discrete: This logic
verifies that the EEC150-20 is connected to an A5 engine. If the
engine harness discrete reads open when installed on an A5 engine,
a fault is set.
OOSENF Overspeed Low Side Enable fault: Flag set when the overspeed Low
Side is not enabled when N1 or N2 latches occur during spool down
overspeed test.
OSDN1C N1 Overspeed Circuit Fault: Fault set when Overspeed Circuit is
found to be inoperative during spool down overspeed test.
OSDN2C N2 Overspeed Circuit Fault: Fault set during spool down test when
N2 when Overspeed Circuit is found to be inoperative.
OSFEEC Overspeed Failure Due to an EEC150-20 Failure: Logic examines all
available fault codes to identify an overspeed failure and isolate
it to the EEC150-20 or FMU. These conditions can cause an
EEC150-20 internal fault code: malfunction detected in the spool
up or spool down overspeed tests, local and remote BID discretes
are outside of N2 set point tolerance, overspeed hardware jumpers
and trip point do not agree, overspeed switch failure, local N2
signal interface failure, external channel depower discrete failed
flag is set.
OSFFMU Overspeed Failure Due to an FMU Failure: logic examines all
applicable fault codes to identify an overspeed failure and
isolate it to the EEC150-40 or FMU. An FMU related fault code can
be set if these conditions are found: overspeed solenoid is failed
open or closed, incorrect local overspeed system operation,
overspeed wraparound or overcurrent failure or an N2 signal
failure.
OSFLCL Overspeed valve is failed closed: this fault is set if the
overspeed solenoid is not energized, but the overspeed feedback
discrete indicates that the valve is in the overspeed (closed)
position for a specified time period. Only set when N2 is
greater than 2500 rpm.
OSFLOP Overspeed valve is failed open: this fault is set if the
overspeed solenoid was energized, but the overspeed feedback
discrete indicates that the valve is in the normal (open)
position for a specified time period.
OSJPRF Overspeed Hardware Jumpers Fault: Fault set when the N1 or N2
hardware overspeed trip points do not agree with engine
configuration trip points.
OSLBDF Below Idle Detect Found Out of N2 Set Point Tolerance: Set when N2
is healthy and either local N2 is greater than 7756 rpm and the
Below Idle discrete indicates below idle or local N2 is less than
7246 rpm and Below Idle Discrete indicates above idle.
OSPXCF Overspeed Valve Position Cross Check Failed: This fault code is
set if the overspeed valve local and crosslink feedback discretes
do not agree for more than a specified time period.
OSRLF Overspeed Current Sense Fault: This fault code is set if the
overspeed solenoid uses too much current. A hardware failure or
lightning strike can cause the overcurrent condition.
OSSONF Overspeed Solenoid Failed On: Logic commands the overspeed
solenoid to move to a specified position. This fault code is set
if the measured position does not agree with the commanded
position (Failed in on position).
OSWAF Overspeed Wraparound Failed. Logic compares the state of the
wraparound discrete to the state of the commanded device. This
fault code is set if the position of the device does not agree
with the wraparound discrete.
OSXBDF Cross Channel Below Idle Detect Found Out of N2 Set Point
Tolerance: Fault set when the remote N2 and crosslink are valid
and either the remote N2 is greater than 4456 rpm and the
crosstalked Below Idle Discrete indicates below idle or remote N2
is less than 7246 rpm and the crosstalked below idle Discrete
above idle.
OVSPA Overspeed Solenoid Energised. This fault is set if the overspeed
test is not performed.
P2EPNI P2 Failed in Channel in Control: Fault set when the channel in
control and P2 is not available to run in EPR mode.
P2IFA P2 Interface Failed: This fault code is set when one of these
checks identify failures: frequency test of F/D converter with a
bad resolver/LVDT excitation signal, range check P2 temperature
diode, range check of P2 signal, checksum failure of sensor
calibration PROM, drift signal test of multiplexer, or voltage
check of A/D converter.
P2L Local P2 Sensor: A local P2 sensor range check failure or a P2
Interface failure sets this fault code.
P2PRF EEPROM Checksum Test: Logic examines the P2 sensor EEPROM data and
EEPROM trim data with a checksum test. Failures set this fault
code.
P2XCF P2 Crosscheck Failure: Logic compares the channel A and B P2
sensor values. This fault code is set if the two values do not
equal each other within a set tolerance range.
P5AS Local P5 Sensor: A local P5 sensor range check failure, a P5
interface failure, or a cross-channel test failure sets this code.
P5ASF P5 Line Failure detected: logic examines external parameters (not
the local sensor) to determine if the P5 sensor is defective.
P5IFA P5 Interface Failed: This fault code is set when one of these
checks identify failures: frequency test of F/D converter with a
bad resolver/LVDT excitation signal, range check of P5 temperature
diode, range check of P5 signal checksum failure of sensor
calibration PROM, drift signal test of multiplexer, or voltage
check of A/D converter.
P5PRF P5 EEPROM Checksum Test: Logic examines the P5 sensor EEPROM data
and EEPROM trim data with a checksum test. Failures set this fault
code.
P5XCF P5 Crosscheck Failure: Logic compares the Channel A and B P5
sensor values. This fault code is set if the two values do not
equal each other within a set tolerance range.
PAMBDF Sensor for Ambient Pressure Found to be Drifting: This fault is
set when the left and right ADC altitudes are within 800 feet of
each other but neither of them are within tolerance of the
reference altitude.
PAMIFA PAMB Iinterface Failed: This fault code is set when one of these
checks identify failures: frequent test of F/D converter with a
bad resolver/LVDT excitation signal, range check of PAMB
temperature diode, range check of PAMB signal, checksum failure of
sensor calibration PROM, drift signal test of multiplexer, or
voltage check of A/D converter.
PAML Local PAMB Sensor: A local PAMB sensor range check failure or a
PAMB interface failure sets this fault code.
PAMPRF EEPRM Checksum Test: Logic examines the PAMB sensor EEPROM data and
EEPROM trim data with a checksum test. A checksum test failure sets
this fault code.
PAMSF Ambient Pressure Sensor Soft Failure: Fault set when the PAMB and
P2 have valid signals but their synthesised altitude calculations
are more than 8500 feet away from each other.
PAMXCF PAMB Crosscheck Failure: Logic compares the Channel A and B PAMB
sensor values. This fault code is set if the two values do not
equal each other within a set tolerance range.
PBHL PB Hard Fault Latched: Logic examines the condition of the PB
sensor with range and rate tests and interface comparison test.
The rate test is used to detect engine surges.
PBHWAF Burner Pressure Wraparound Failed: Logic compares the state of the
wraparound discrete to the state of the commanded device. This
fault code is set if the commanded device does not agree with the
wraparound device.
PBIFA PB Interface Failed: This fault code is set when one of these
checks identify failures: frequency test of F/D converter with a
bad resolver/LVDT excitation signal, range check of PB temperature
diode, range check of PB signal, checksum failure of sensor
calibration PROM, drift signal test of multiplexer, or voltage
check of A/D converter.
PBPRF PB EEPROM Checksum test: Logic examines the PB sensor EEPROM data
and EEPROM trim data with a checksum test. Failure set this fault
code.
PBSL PB Soft Fault: Logic compares the local and remote Pb signals to
the upper and lower PB soft fault limits. A soft fault is set if
signals go above the limits and timer does not expire. A hard
fault is set if the signals go above the limits and the timer
expires.
PBSSTL Starting Stall in Channel in Control: This fault is set when PB is
decreasing greater than the surge limit and N2 is greater than
7540 rpm.
PBPSTL Stall Above Idle in Channel in Control: This fault is set when PB
decreasing greater than the surge limit, the channel is in control
and N2 less than 7840 rpm.
PBXCF PB Crosscheck Failure: Logic compares the Channel A and B PB
sensor values. This fault code is set if the two values do not
equal each other within a set tolerance range.
PHF Parity test Error: Logic examines the operation of the parity test
circuitry. It reads a memory location that has a known parity
error. This fault code is set if the parity test does not cause a
POR to occur.
PMXIFA PMXIFA interface Failed: This fault code is set when one of these
checks identifies failures: frequency test of F/D converter with a
bad resolver/LVDT excitation signal, range check of P12.5 (CH A)
or P2.5 (CH B) temperature diode, range check of P12.5 or P2.5
signal, checksum failure of sensor calibration PROM, drift signal
test of multiplexer, or voltage check of A/D converter.
P125/P25L PMX (P12.5/P2.5) Failed: This fault code is set if the local PMX
sensor range check or PMX interface identifies failures.
PMXPRF PMX EEPROM Checksum Test: Logic examines the condition of the PMX
sensor EEPROM data and EEPROM trim data with a checksum test. A
checksum failure sets this fault code.
PSNSRF Pressure Sensor Disagree: Logic compares the pressure difference
between pressure sensor pairs to a specified tolerance. This fault
code identifies a pass/fail status. Because of close pressure
tolerances, this logic can function only during a maintenance
test.
PTHDIS P2/T2 Probe Heater Disagree: This fault code is set if the PTH
relay discrete does not agree with the PTH relay switch command.
PTHFOF Manual Mode P2/T2 heater Test Failed: This fault is set when the
heater is commanded on but the feedback signal indicates it is
still off.
PTHFON Menu Mode P2/T2 heater Test Failed On: This fault is set when the
heater is commanded off but the feedback signal indicates it is
still on.
PTHFS P2/T2 Heater failed Safe: Fault is set in menu mode when running
the P2/T2 heater test when any of the following is true: discrete
mux 2 interface is failed, hardware depower is detected, P2/T2
loop status not capable.
PTHWAF P2/T" Heater Wraparound Failed: Logic compares the state of the
wraparound discrete to the state of the commanded device. This
fault code is set if the position of the device does not agree
with the wraparound discrete.
PTHWAI P2/T2 Relay Wraparound Failure: Set when channel in control and a
P2/T2 wraparound fault is detected.
PTHXCF P2/T2 Probe Heater Relay Cross check Failed: This fault code is
set if the P2/T2 local and crosslink feedback discretes do not
agree for more than a specified time period.
RADCNG Right ADIR Link failure: Logic examines the condition of an ARINC
word received from the serial data interface with parity and range
checks. Logic also examines the satus of the wraparound test.
Logic also detects lack-of-data and intermittent data conditions.
RAMPOR RAM Parity Error caused Reset: This test is done during EEC150-20
power up. Logic does a RAM checksum test of all program memory
locations.
RCVR2F ARINC receiver 2 Failure: Logic looks for the correct reception
of an ARINC test word through the serial data interface. Logic
does parity and range checks. Logic also looks for lack of data
and intermittent data conditions.
RCVRF ARINC Receiver Failure: Logic looks for the correct reception of
an ARINC test word through the serial data interface. Logic does
parity and range checks. Logic also looks for a lack of data and
intermittent data conditions.
RESIFA RES/LVDT Interface Failed: Logic does a range check of DRIFT and
TEST signals to examine operation of the Resolver/LVDT interface
Range check failures or an A/D circuit failure set this fault
code. The DRIFT and TEST signals compensate for operational drift
in the resolver and LVDT circuits.
REVILF Reverser Group Solenoid Current Sense Fault: This fault code is
set if the reverser Group solenoids use too much current. A
hardware failure or a lightning strike can cause an overcurrent
condition.
REVINH Reverser Inhibit Flag: Set when mach number is greater than 0.53,
weight on wheels is true and P2 and altitude are valid.
REVLFF Reverser Position Failed: Logic compares the local and crosslink
feedback signals of the thrust reverser LVDT to each other and to
a synthesised value. This fault code is set if these signals are
different from each other by more than a specified value.
REVMMF Menu Mode Reverser Test Fault Due to Reverser: This fault is set
if the reverser is neither stowed or deployed for a given period
or the reverser test is not activated.
REVUIA Reverser Unlocked in Flight (Confirmed or Fault Recording): Set
when both the following conditions occur: (1) Selected TRA is less
than the high end of resolver idle point or weight is not on
wheels (2) Reverser feedback's indicate deployed or the local and
remote reverser discretes indicate deployed.
REVXCW Reverser Crosscheck Due to Local reverser feedback Failure: This
fault is set when, after the local and remote feddback's are
healthy for a period, the local feedback drifts slowly out of
range. This will cause the crosscheck and local hard failure to
both be set.
RLKFLL Additional Reverser Lock Failed Closed.
RLKFLU Additional Reverser Lock Failed Open.
ROMPOR ROM Parity Error Caused Reset: This test is done during EEC150-20
power up. Logic does a ROM checksum test of all program memory
locations.
RRWF RAM Test Failure Flag: Logic does a write/read test on all RAM
locations. Logic also examines the initialised values of eight RAM
locations. This fault code is set if a location fails a write/read
test or contains an incorrect value.
RSF ROM Checksum Failure: logic does checksum tests on ROM. A
checksum failure will set this fault code and transmit an ARINC
message.
RSLDL Deploy Command and Both Lock Sensors Indicate Locked: This fault
code is set if both sensors identify a locked condition in the
thrust reverser system.
RSLXCW Reverser Stow and Lock Crosscheck Failure: Fault set when weight
is on wheels, reverser lock discretes disagree for more than 5
seconds and the reverser lock discretes are not in a configuration
consistent with the reverser command and the arming solenoid
position discrete.
RSLXF Resolver/LVDT Excitation failure: Logic examines the resolver/LVDT
excitation signal for correct frequency and amplitude. This fault
is set if amplitude and/or frequency are not correct.
RVNDLK Additional Reverser lock detected in the locked position while
expected to be in the unlocked position.
RVNDPL Deploy Commanded reverser Not Deployed and One Lock Sensor
Indicates Locked: This fault code is set if the thrust reverser is
commanded deployed but the sensor identifies a locked condition.
RVSLOW Reverser Stow Time Exceed Maximum limit: Fault set when the
reverser is not being commanded and the selected reverser position
has been greater than 3.2 % deployed for longer than 8 seconds.
SBCTRF Status Buffer or Watchdog/Parity Fault Downcounter Failed: Logic
sets the fault downcounter to a specified value. This fault code
is set if the same value is not read back from the fault
downcounter.
SOVFO Shut Off Valved Failed Open Flag: Flag set when both the arming
solenoids indicate high pressure, the Shut Off Valve is installed
and the Shut Off Valve test has been running for more than 20
seconds.
SPVFC Spill Valve Failed Closed: Set when channel in control and all of
the following are true (1) Selected spill valve feedback is less
than the full open position (2) weight is in wheels (3) Selected
N2 is greater than 3000 pm (4) wet crank is being performed.
SPVFO Spill Valve Failed Open: Logic commands the spill valve to move to
the open position. This fault code is set if the measured position
does not agree with the commanded position.
SPVL Spill Valve Input Failed: Logic compares the local and crosslink
feedback signals of the Spill Valve LVDT to each other and to a
synthesised value. This fault code is set if these signals are
different from each other by more than a specified value.
SPVTK SPV Track Check Failure: This fault is set if the sensed position
of the device does not agree with the commanded position.
SPVWAF SPV Torque Motor Wraparound Failed: Logic changes the AAC
torque-motor-current feedback-voltage to a digital torque motor
current value. This value is compared to the commanded torque
motor current. This fault code is set if the feedback voltage is
out of range check limits or the comparison identifies a failure.
SPVXCF SPV Feedback Crosscheck Failed: This fault code is set if the
local and crosslink feedback values for the Spill Valve LVDT does
not agree for more than a specified time period.
STBWPF Status Buffer or Watchdog/parity Fault: Logic clears the system
Status Word and hardware depower word and then does a check to see
if the two words are cleared. This fault code is set if the two
words are not cleared.
STHUNI Hung Start in Channel in Control: Flag set the channel in
control, N2 is valid and less than 1500 rpm, and the starter air
valve has been commanded on for more than 20 seconds.
STVFCL Starter Valve Failed Closed: This fault code is set if the starter
valve is commanded closed but sensors do not agree.
STVFLL Starter Air Valve Failed: Logic compares the local and crosslink
feedback signals of the starter air valve to each other and to a
synthesised value. This fault code is set if these values are
different from each other by more than a specified value.
STVFOP Starter Valve Failed Open: This fault code is set if the starter
air valve is commanded open but the sensors do not agree.
STVWAF Engine Starter Valve Wraparound Failed: Logic compares the state
of the wraparound discrete to the state of the commanded device.
This fault code is set if the position of the device does not
agree with the wraparound discrete.
STVXCF Starter Air Valve Position Crosscheck Failed: This fault code is
set if the starter air valve position local and crosslink
feedback discretes do not agree for more than a specified time
period.
SVAL SVA Resolver Feedback: Logic compares the local and crosslink
feedback signals of the SVA LVDT to each other and to a
synthesised value. This fault code is set if these signals are
different from each other by more than a specified value.
SVATK SVA Track Check Failure: This fault is set if the sensed position
of the device does not agree with the commanded position.
SVAWAF SVA Torque Motor Wraparound Failed: Logic changes the SVA
torque-motor current feedback-voltage to a digital torque motor
current value. This value is compared to the commanded torque
motor current. This fault code is set if the feedback voltage is
out of range check limits or the comparaison identifies a failure.
SVAXCF SVA Feedback Crosscheck Failed: This fault code is set if the
local and crosslink feedback values for the SVA LVDT do not agree
for more than a specified time period.
T25L T2.5 Input Failed: This fault code is set if the local T2.5 value
has an upper or lower range check failure or has a rate test
failure.
T2IL T2 Probe Interface Failed: Logic uses (Logical OR) T2 interface
fault bit and A/D converters to identify a T2 interface fault. A
failure of the range check of the T2X10 signal sets this fault
code.
T2L T2 Local Channel Failed: This fault code is set if the local T2
value has an upper or lower range check failure or has a rate test
failure.
T2NAI T2 Failed in Channel in Control: This fault is set when channel in
control and either local or remote T2 signals are failed or the T2
probe is commanded on but the feedback indicates that it is off.
T2SSF T2 Sensor Soft Failed: Fault is set when the left and right ADC T2
values disagree with the T2 reference value by more than 8 deg. C
for more than 10 seconds.
T2XCF T2 Crosscheck Failed: This fault code is set if the local T2 and
crosslink feedback values do not agree for more than a specified
time period.
T3L T3 Input Failed: This fault code is set if the local T3 value has
an upper or lower range check failure or has a rate test failure.
T3XCF T3 Crosscheck Failed: This fault code is set if the local and
crosslink feedback values for T3 do not agree for more than a
specified time period.
T5EXCI T5 Exceedance in Channel in Control: Flag set when channel in
control, the T5 selected feedback is greater than 635 deg. C and
the selected output is not equal to the past value.
T5L T5 Input Failed: This fault code is set if the local T5 value has
an upper or lower range check failure or has a rate test failure.
T5OVL T5 Overlimit. Fault set when the selected T5 feedback is greater
than 650 deg. C for A321 or 635 deg. C for A319, A320 aircraft.
T5XCF T5 Crosscheck Failed: This fault code is set if the T5 local and
crosslink feedback values do not agree for more than a specified
time period.
TCIL Thermocouple Interface Failed: Logic uses (Logical OR) CJC
interface fault bit and A/D converters to identify a thermocouple
interface fault. A failure of the range check of the CJC A/D count
signal sets this fault code.
TEMOVT Engine Oil Temperature Over Limits. This fault is set if the
engine oil temperature goes above a specified value.
TFL Fuel temperature Failed: This fault code is set if the local Fuel
Temperature value has an upper or lower range check failure or has
a rate test failure.
TFLAG WWC150-40 Exceeded the CJC temperature Limit: This fault code is
set if the EEC150-20 temprature goes above a specified limit. The
fault code does not necessarily identify an EEC150-20 malfunction.
It usually functions as an environmental status indication.
TFMOVT Fuel Temperature Over Limits: This fault is set if the fuel
temperature goes above a specific value.
TFXCFA Fuel Temperature Cross-Check Failed. This fault code is set if the
local and crosslink feedback values for the fuel temperatuure do
not agree for more than a specified time period.
TIMOVT IDG Oil Temperature Over Limits: This fault is set if the IDG oil
temperature goes above a specified value.
TMAFL TMA Valve Failed: Logic compares the solenoid wraparound discrete
of the TMA valve to the switch command. This fault code is set if
the actual position does not agree with the commanded position or
the solenoid cannot be failsafed.
TMAWAF Turbine Make-Up Air Wraparound Failed: Logic compares the state of
the wraparound discrete to the state of the commanded device. This
fault code is set if the position of the device does not agree
with the wraparound discrete.
TMAXCF TMA Valve position Cross-Check Failed: This fault code is set if
the local and crosslink feedback values for the TMA Valve do not
agree for more than a specified time period.
TOEL Engine Oil Temperature Failed: This fault code is set if the local
Engine Oil Temperature value has an upper or lower range check
failure or has a rate test failure.
TOEXCF Engine Oil Temperature Cross-Check Failed: This fault code is set
if the local and crosslink feedback values for the engine oil
temperature do not agree for more than a specified time period.
TOIL IDG Oil Temperature Range Failed: This fault code is set if the
local value for the IDG oil temperature has an upper or lower range
check failure or has a rate test failure.
TOIXCF IDG Oil Temperature Cross-Check Failed: This fault code is set if
the local and crosslink feedback values for the IDG oil
temperature do not agree for more than a specified time period.
TRAL TRA Input Failed: This fault code is set if the local TRA input
is range or rate failed for a specified amount of time.
TOTONG A319 Third Rating TO/GA Selection Non-dispatchable: Set when
Engine Run Mode is enabled and GND3FL is set.
TRAMMF Menu Mode Reverser Test Fault Due to TRA: This fault could be set
for the following: Reverser test is not activated, TRA select code
= remote, time out in reverse test and CER C displayed over 60
seconds.
TRAXCF TRA Cross-Check Failed: This fault code is set if the local and
remote TRA resolver angles do not agree for more than a specified
time period.
UXOSUL Unexpected Overspeed Status Latch: Fault set when either N1 or N2
hardware overspeed latches are set during a spool up overspeed
test.
VOIDBF Failure of the OUTCOM/IOPCOM Data Bus Test: EEC internal fault.
Built-in test on corrupted data in one channel has failed.
WDTF Watchdog Timer Failed: Logic measures the time between watchdog
keep-alive pulses to examine for correct watchdog timer operation.
This fault code is set if the measured time is larger than a
specified value.
WDTPOR Watchdog Timer error Caused Reset: The watchdog timer looks for a
pulse. If the pulse does not occur during a specified time period,
the watchdog timer sets an error flag.
WFL Fuel Flow Resolver Feedback: Logic compares the local and
crosslink feedback signals of the WF resolver to each other and to
a synthesised value. This fault code is set if these values are
different from each other by more than a specified value.
WFTK WF resolver Track Check failure: This fault is set if the sensed
position of the device does not agree with the commanded position.
WFWAF WF Torque Motor Wraparound Failed: Logic changes the WF
torque-motor-current feedback-voltage to a digital torque motor
current value. This value is compared to the commanded torque
motor current. This fault code is set if the feedback voltage is
out of range check limits or the comparison identifies a failure.
WFXCF WF resolver Feedback Cross-Check Failed: This fault code is set if
the local and crosslink feedback values for the WF resolver do not
agree for more than a specified time period.
WHPFLL HP fuel Valve Failed: Logic compares the solenoid wraparound
discrete of the HP fuel valve to the switch command. The fault
code is set if the actual position does not agree with the
commanded position or the solenoid cannot be failsafed.
WNFILF Fuel Flow On/Off Bi-Directional Solenoid Current Sense Fault: This
fault code is set if the WF bi-directional solenoid uses too much
current. A hardware failure or a lightning strike can cause the
overcurrent condition.
WNFILI Fuel On/Off Solenoid Overcurrent: Fault set when channel in
control and an overcurrent is detected in the fuel on/off
bi-directional solenoid.
WOFWAF Fuel Flow On/Off, Off Wraparound Failed: Logic compares the state
of the wraparound discrete to the state of the commanded device.
This fault code is set if the position of the device does not
agree with the wraparound discrete.
WOFWAI Fuel Off Solenoid Wraparound Failure: Fault set when channel in
control and a wraparound fault is detected in the fuel off
solenoid.
WONDFS Fuel Flow On/Off Solenoid Failsafed: Flag set when engine still
above idle 10 seconds after the fuel has been shut off indicating
solenoid failsafed to the On position.
WONWAF Fuel Flow On/Off, On Wraparound Failed: Logic compares the state
of the wraparound discrete to the state of the commanded device.
The fault code is set if the position of the device does not agree
with the wraparound discrete.
WONWAI Fuel On Solenoid Wraparound: Fault set when channel in control and
a wraparound fault of the Fuel Off Solenoid is detected.
WONXCF Fuel On/Off Cross-Check Failed: This fault code is set if the WF
local and crosslink feedback discretes do not agree for more than
a specified time period.
XLINKL Crosslink Latched Fail Flag: Logic makes sure that these
conditions do not last longer than a set period of time; crosslink
lables are not synchronised, watchdog timers are not synchronised,
or the remote-channel SYNC discrete signal remains reset.
XMT1F ARINC Wraparound 1 Test Failure (W/A 2 is correct): Logic
examines a wraparound signal to examine ARINC 1 output
operation. This fault code is set if the receiver is operating
properly but received data from the wraparound is not the same as
the transmitted data.
XMT2F ARINC Wraparound - 2 Failure (W/A 1 is correct): Logic examines
a wraparound signal to examine ARINC 2 output operation. This
fault code is set if the receiver is operating properly but
received data from the wraparound is not the same as the
transmitted data.
XMTRF ARINC Transmitter Failure: This fault is set if transmitter 2
fails. This occurs when ARINC wraparound 2 fails, but receiver
1 data is correct. (Wraparound 2 is read through receiver 1).
XMTRF1 ARINC Transmitter 1 Failure: This fault is set when ARINC
wraparound 1 fails but receiver 2 data is correct (wraparound
1 data is read into receiver 2).
XOSENF Local Channels remote Overspeed High-Side Enable Fault: Fault set
when remote channel is running the spool down overspeed test and
the local channel does not detect the overspeed high side switch
being closed.
XSWDOA Remote Channel Did Not Take Control When the local Channel
Requested a Switchover: Logic examines the ability of the opposite
channel to take control of the engine. This test is done only
during engine spool up or spool down. This fault code is set if
the opposite channel does not take control when commanded.
XTDPOR External Disturbance Caused POR: This fault code is set if an
external disturbance caused POR (not caused by parity or watchdog
tests).
73-20 - (IAE) - CONTROLLING
73-20-00 - (IAE) - CONTROLLING
73-20-00 PB 201 CONF 13 - CONTROLLING - FAULT ISOLATION PROCEDURES [Rev.6 from Feb 2017] 2026.04.04 04:36:09 UTC