W DOC AIRBUS | TSM A320F

NAI Thermocouple Temperature Signal Failure on Channels A and B

TASK 30-21-00-810-837-A
NAI Thermocouple Temperature Signal Failure on Channels A and B

1. Possible Causes
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 71-00-00-810-835-A
Component and Harness Intermittent Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults
AMM 30-21-24-000-801
Removal of the Nacelle Anti-Ice Fan Case Thermocouple
AMM 30-21-24-400-801
Installation of the Nacelle Anti-Ice Fan Case Thermocouple
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 715134
AMM 73-21-00-710-806
Test No.7 - EEC Operation Test (Self Test)
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 73-21-63-000-802
Removal of the Electronic Engine Control (EEC) Wiring Harness (W03)
AMM 73-21-63-400-802
Installation of the Electronic Engine Control (EEC) Wiring Harness (W03)
AMM 73-21-64-000-802
Removal of the Electronic Engine Control (EEC) Wiring Harness (W04)
AMM 73-21-64-400-802
Installation of the Electronic Engine Control (EEC) Wiring Harness (W04)
3. Fault Confirmation
Subtask 30-21-00-730-074-A ** ON A/C NOT FOR ALL
A. Test
Do the EEC system test AMM 73-21-00-710-806.
   (1) If the maintenance message does not come into view again, do the component and harness intermittent for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-835).
     (a) If you find no fault, send the engine back to service and monitor the engine to make sure that the maintenance message does not come into view again.
   (2) If the maintenance message comes into view again (hard fault) for Channels A and B, 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 30-21-00-810-087-A ** ON A/C NOT FOR ALL
A. If there is confirmation of the fault:
   (1) Open the fan cowl-doors AMM 71-13-00-010-802.
   (2) Make sure that the electrical connector 4113VC-A of the fan-case overheat-indication thermocouple-assembly is correctly engaged in the socket.
  • If it is not correctly engaged, engage it.
  • Do the test given in Para. 3.
   (3) If fault continues, disconnect the electrical connector 4113VC-A and do a visual inspection of electrical connector 4113VC-A of the fan-case overheat-indication thermocouple-assembly for bent pins, contamination or corrosion or visual signs of damage.
     (a) If you find damage on electrical connector 4113VC-A:
     (b) If you find no damage on the receptacle 4113VC and on electrical connector 4113VC-A:
       1 Do a resistance check AWM 715134 between:
. Pin 4113VC-A/4 and pin 4113VC-A/12 of the fan-case overheat-indication thermocouple-assembly
. Pin 4113VC-A/6 and pin 4113VC-A/7 of the fan-case overheat-indication thermocouple-assembly
         a If the resistance is more than 250 ohm:
         b If the resistance is less than 250 ohm:
  • Use the PLIERS - JAWED, SOFT to disconnect electrical connector P13 from the EEC and do a continuity check AWM 715134 of the W04 harness between:
    . Pin P13/m of the EEC and pin J55/12 of 4113VC
    . Pin P13/k of the EEC and pin J55/4 of 4113VC.
  • If there is no continuity:
  • Replace the W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
  • Do the test given in Para. 3.
  • If there is continuity:
  • Use the PLIERS - JAWED, SOFT and disconnect electrical connector P14 from the EEC and do a continuity check AWM 715134 of the W03 and W04 harnesses between:
    . Pin P14/m of the EEC and pin J55/7 of 4113VC
    . Pin P14/k of the EEC and pin J55/6 of 4113VC.
  • If there is no continuity:
  • Disconnect connector P107 of the 4101VC and do a continuity check AWM 715134 of the W03 harness between:
    . Pin P14/m of the EEC and pin P107/42 of 4101VC
    . Pin P14/k of the EEC and pin P107/43 of 4101VC.
  • If there is no continuity:
  • Replace the W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
  • Do the test given in Para. 3.
  • If there is continuity:
  • Do a continuity check AWM 715134 of the W04 harness between:
    . Pin J107/42 of the 4101VC and pin J55/7 of 4113VC
    . Pin J107/43 of the 4101VC and pin J55/6 of 4113VC
  • If there is no continuity:
  • Replace the W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802.
  • If there is continuity:
  • Replace the [4000KS] AMM 73-21-01-000-801 and AMM 73-21-01-400-801.
  • Do the test given in Para. 3.
5. Close-up
Subtask 30-21-00-942-079-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 04:29:34 UTC
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