DOC AIRBUS | TSM A320FRight TLV Failed Open
TASK 78-31-00-810-985-A
Right TLV Failed Open
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 78-31-00-865-059-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:38:18 UTC
Right TLV Failed Open
1. Possible Causes
RELAY-THRUST REVERSER LOCKING POWER (2EG) - RH TRAS LOCK VALVE [4142KS]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 71-00-00-810-843-A | Nacelle Component and Harness Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults |
| AMM 78-31-00-710-805 | Operational Test of Thrust Reverser with MCDU |
| AWM 783601 | |
| AWM 783602 | |
| AMM 78-37-02-000-801 | Removal of the TRAS Track Lock Valve |
| AMM 78-37-02-400-801 | Installation of the TRAS Track Lock Valve |
Subtask 78-31-00-865-059-A ** ON A/C NOT FOR ALL
A. Table of the circuit breakers referred to in this procedure:
Subtask 78-31-00-710-300-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1) | |||
| 121VU | ENG1/REV/LOCK | 1EG1 | N44 |
| FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2) | |||
| 121VU | ENG2/REV/LOCK | 1EG2 | N45 |
B. 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(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.
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.
Subtask 78-31-00-810-329-A ** ON A/C NOT FOR ALL A. If there is confirmation of the fault:
(1) Check if same fault comes on also on left side:
(a) If yes:
1 Open, safety and tag the circuit breaker 1EG1 for fault on ENG 1 or 1EG2 for fault on ENG 2.
2 ReplaceRELAY-THRUST REVERSER LOCKING POWER (2EG)
a For fault on ENG 1, refer to AWM 783601.
b For fault on ENG 2, refer to AWM 783602.
3 Remove the safety clips and tags and close the circuit breaker 1EG1 for fault on ENG 1 or 1EG2 for fault on ENG 2.
(b) If no:
1 Replace RH TRAS LOCK VALVE [4142KS] AMM 78-37-02-000-801 and AMM 78-37-02-400-801.
2 Do the test given in Para. 3.
(1) Check if same fault comes on also on left side:
(a) If yes:
1 Open, safety and tag the circuit breaker 1EG1 for fault on ENG 1 or 1EG2 for fault on ENG 2.
2 Replace
a For fault on ENG 1, refer to AWM 783601.
b For fault on ENG 2, refer to AWM 783602.
3 Remove the safety clips and tags and close the circuit breaker 1EG1 for fault on ENG 1 or 1EG2 for fault on ENG 2.
(b) If no:
1 Replace RH TRAS LOCK VALVE [4142KS] AMM 78-37-02-000-801 and AMM 78-37-02-400-801.
2 Do the test given in Para. 3.