W DOC AIRBUS | TSM A320F

Right Hand Lower Locking Feedback Actuator Proximity Switch Disagreement Failure

TASK 78-31-00-810-962-A
Right Hand Lower Locking Feedback Actuator Proximity Switch Disagreement Failure

1. Possible Causes
  • R LOWER ACTUATOR [3040KM1]
  • HARNESS - RIGHT TRAS [4132KS]
  • HARNESS - PYLON T/R [4130KS]
  • EEC WIRING HARNESS WF06 [4089KS]
  • EEC WIRING HARNESS WF07 [4093KS]
  • PROX SENSOR-R T/R LOWER PRIMARY LOCK, CHAN A [4035KS]
  • PROX SENSOR-R T/R LOWER PRIMARY LOCK, CHAN B [4043KS]
  • [4000KS]
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
PLIERS - JAWED, SOFT
 B. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 71-00-00-810-843-A
Nacelle Component and Harness Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults
AMM 71-13-00-010-802
Opening of the Fan Cowl Doors
AMM 71-13-00-410-802
Closing of the Fan Cowl Doors
AWM 715135
AWM 715136
AWM 715178
AWM 715179
AMM 73-21-01-000-801
Removal of the Electronic Engine Control (EEC)
AMM 73-21-01-400-801
Installation of the Electronic Engine Control (EEC)
AMM 73-21-66-000-802
Removal of the Electronic Engine Control (EEC) Wiring Harness (WF06)
AMM 73-21-66-400-802
Installation of the Electronic Engine Control (EEC) Wiring Harness (WF06)
AMM 73-21-67-000-801
Removal of the Electronic Engine Control (EEC) Wiring Harness (WF07)
AMM 73-21-67-400-801
Installation of the Electronic Engine Control (EEC) Wiring Harness (WF07)
AMM 78-31-00-210-802
General Visual Inspection (GVI) of the Proximity Sensor Targets
AMM 78-31-00-710-805
Operational Test of Thrust Reverser with MCDU
AMM 78-31-03-000-801
Removal of the TRAS Locking Actuator
AMM 78-31-03-400-801
Installation of the TRAS Locking Actuator
AMM 78-31-20-000-801
Removal of the TRAS Actuator Proximity-Sensors
AMM 78-31-20-400-801
Installation of the TRAS Actuator Proximity-Sensors
AMM 78-31-61-000-812
Removal of the Right TRAS Monitoring Harness
AMM 78-31-61-000-813
Removal of the Pylon TRAS Monitoring Harness
AMM 78-31-61-400-812
Installation of the Right TRAS Monitoring Harness
AMM 78-31-61-400-813
Installation of the Pylon TRAS Monitoring Harness
3. Fault Confirmation
Subtask 78-31-00-710-277-A ** ON A/C NOT FOR ALL
A. Do the operational test of the thrust reverser with the MCDU to confirm this fault AMM 78-31-00-710-805.
   (1) If the maintenance message does not come back, troubleshoot as described in the nacelle component and harness troubleshooting procedure for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-843).
     (a) Monitor the engine for reoccurring maintenance message.
   (2) If the maintenance message comes back (hard fault), go to the Para. Fault Isolation.
4. Fault Isolation
WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.
CAUTION: MAKE SURE YOU REMOVE ELECTRICAL POWER FROM THE EEC BEFORE YOU REMOVE THE ELECTRICAL CONNECTORS. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EEC CAN OCCUR.
Subtask 78-31-00-810-306-A ** ON A/C NOT FOR ALL
A. If there is confirmation of the fault:
   (1) Get access to right hand lower locking feedback actuator and EEC (4000KS):
     (a) Open the fan cowl doors AMM 71-13-00-010-802.
   (2) On actuator, at proximity sensors (4035KS) and (4043KS), make sure that the target is not missing and do a visual inspection of the target for bend, breakage or damage AMM 78-31-00-210-802.
     (a) If you find a bend, breakage or other damage, or if the target is missing:
       1 Replace R LOWER ACTUATOR [3040KM1] AMM 78-31-03-000-801 and AMM 78-31-03-400-801.
       2 Do the test given in Para. 3.
   (3) If you find no damage or if the fault continues:
     (a) Check for the correct engagement of connectors (4035KS-A) and (4043KS-A).
       1 Repair as necessary.
       2 Do the test given in Para. 3.
   (4) If check is OK or if the fault continues, use a PLIERS - JAWED, SOFT to disconnect connectors (4035KS-A) and (4043KS-A) and do a visual inspection of the connector for bent pins, contamination or corrosion or other signs of damage.
     (a) If you fin damage, replace HARNESS - RIGHT TRAS [4132KS] AMM 78-31-61-000-812 and AMM 78-31-61-400-812.
     (b) Do the test given in Para. 3.
   (5) If you find no damage or if the fault continues, disconnect connectors (4054VC-A) and (4055VC-A) AWM 715178 and AWM 715179.
     (a) Do a visual inspection of the connector for bent pins, contamination or corrosion or other signs of damage.
     (b) Do a continuity check (less than 5 ohms) between the pins of connectors (4035KS-A) and (4054VC) as follows:
  • Pin 2 and pin 6
  • Pin 5 and pin 16
  • Pin 3 and pin 17.
     (c) Do a continuity check (less than 5 ohms) between the pins of connectors (4043KS-A) and (4055VC) as follows:
  • Pin 2 and pin 6
  • Pin 5 and pin 16
  • Pin 3 and pin 17.
     (d) Do a check of each wire for wire-to-wire, short circuit and short to ground.
     (e) If you find damage, replace HARNESS - RIGHT TRAS [4132KS] AMM 78-31-61-000-812 and AMM 78-31-61-400-812.
       1 Reconnect all connectors.
       2 Do the test given in Para. 3.
   (6) If you find no damage, disconnect connectors (491VC-A) and (494VC-A) AWM 715178 and AWM 715179.
     (a) Do a visual inspection of the connectors for bent pins, contamination or corrosion or other signs of damage.
     (b) Do a continuity check (less than 5 ohms) between the pins of connectors (4054VC-A) and (491VC) as follows:
  • Pin 6 and pin 13
  • Pin 16 and pin 29
  • Pin 17 and pin 30.
     (c) Do a continuity check (less than 5 ohms) between the pins of connectors (4055VC-A) and (494VC) as follows:
  • Pin 6 and pin 13
  • Pin 16 and pin 29
  • Pin 17 and pin 30.
     (d) Do a check of each wire for wire-to-wire, short circuit and short to ground.
     (e) If you find a fault:
       1 Replace HARNESS - PYLON T/R [4130KS] AMM 78-31-61-000-813 and AMM 78-31-61-400-813.
       2 Reconnect all connectors.
       3 Do the test given in Para. 3.
   (7) If your find no damage or if the fault continues, disconnect connectors P7 and P8 from EEC (4000KS) AWM 715135 and AWM 715136.
     (a) Do a visual inspection of the connector for bent pins, contamination or corrosion or other signs of damage.
     (b) Do a continuity check (less than 5 ohms) between the pins of connectors P7 (4000KS-P7) and (491VC-A) as follows:
  • Pin HH and pin 13
  • Pin NN and pin 29
  • Pin MM and pin 30.
     (c) Do a continuity check (less than 5 ohms) between the pins of connectors P8 (4000KS-P8) and (494VC-A) as follows:
  • Pin HH and pin 13
  • Pin NN and pin 29
  • Pin MM and pin 30.
     (d) Do a check of each wire for wire-to-wire, short circuit and short to ground.
     (e) If you find a fault:
       1 Replace EEC WIRING HARNESS WF06 [4089KS] AMM 73-21-66-000-802 and AMM 73-21-66-400-802 and/or,
       2 Replace EEC WIRING HARNESS WF07 [4093KS] AMM 73-21-67-000-801 and AMM 73-21-67-400-801.
       3 Reconnect all connectors.
       4 Do the test given in Para. 3.
   (8) If you find no damage or if the fault continues:
     (a) Replace PROX SENSOR-R T/R LOWER PRIMARY LOCK, CHAN A [4035KS] AMM 78-31-20-000-801 and AMM 78-31-20-400-801 and,
     (b) Replace PROX SENSOR-R T/R LOWER PRIMARY LOCK, CHAN B [4043KS] AMM 78-31-20-000-801 and AMM 78-31-20-400-801.
     (c) Do the test given in Para. 3.
   (9) If the fault continues:
     (a) Replace [4000KS] AMM 73-21-01-000-801 and AMM 73-21-01-400-801.
5. Close-up
Subtask 78-31-00-860-071-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
   (1) Make sure that the work area is clean and clear of tools and other items.
     (a) Close the fan cowl doors AMM 71-13-00-410-802.
[Rev.8 from Aug 2018] 2026.04.04 04:38:15 UTC
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