DOC AIRBUS | TSM A320FFailure of the Thrust Reverser Deploy Indication
TASK 78-31-00-810-870-A
Failure of the Thrust Reverser Deploy Indication
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 78-31-00-710-184-A ** ON A/C NOT FOR ALL
Subtask 78-31-00-810-129-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:38:05 UTC
Failure of the Thrust Reverser Deploy Indication
1. Possible Causes
- harnesses J5 and J6
- thrust reverser harness
- SW-BLOCKER DOOR DEPLOY, L [4103KS1]
- SW-BLOCKER DOOR DEPLOY, R [4103KS2]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 78-31-00-810-869-A | Slow Operation or non Deployment of the Thrust Reverser |
| AMM 71-51-43-000-049 | Removal of the ECU (Channel A) to Thrust Reverser Junction Box Harnesses |
| AMM 71-51-43-400-049 | Installation of the ECU (Channel A) to Thrust Reverser Junction Box Harnesses |
| AMM 71-51-44-000-002 | Removal of the Thrust Reverser Harness 238W0908 |
| AMM 71-51-44-400-002 | Installation of the Thrust Reverser Harness 238W0908 |
| AMM 78-31-00-710-040 | Operational Test of the Thrust Reverser System |
| AMM 78-31-00-710-042 | Operational Test of the Thrust Reverser System |
| AMM 78-31-17-000-001 | Removal of the Blocker Door Deploy Switch |
| AMM 78-31-17-000-002 | Removal of the Beam Electrical Harness |
| AMM 78-31-17-000-040 | Removal of the Blocker Door Deploy Switch |
| AMM 78-31-17-000-041 | Removal of the Beam Electrical Harness |
| AMM 78-31-17-210-001 | Detailed Visual Inspection of the Deploy Switches and Triggers |
| AMM 78-31-17-210-040 | Detailed Visual Inspection of the Deploy Switches and Triggers |
| AMM 78-31-17-400-001 | Installation of the Blocker Door Deploy Switch |
| AMM 78-31-17-400-002 | Installation of the Beam Electrical Harness |
| AMM 78-31-17-400-040 | Installation of the Blocker Door Deploy Switch |
| AMM 78-31-17-400-041 | Installation of the Beam Electrical Harness |
| AMM 78-32-41-000-001 | Removal of the Lower Blocker Door |
| AMM 78-32-41-000-002 | Removal of the Upper Blocker Door |
| AMM 78-32-41-000-040 | Removal of the Lower Blocker Door |
| AMM 78-32-41-000-041 | Removal of the Upper Blocker Door |
| AMM 78-32-41-400-001 | Installation of the Lower Blocker Door |
| AMM 78-32-41-400-002 | Installation of the Upper Blocker Door |
| AMM 78-32-41-400-040 | Installation of the Lower Blocker Door |
| AMM 78-32-41-400-041 | Installation of the Upper Blocker Door |
Subtask 78-31-00-710-184-A ** ON A/C NOT FOR ALL
A. Test
(1) Not applicable.
(2) If the amber REV indication was associated to normal deployment of the blocker doors:
4. Fault Isolation(1) Not applicable.
(2) If the amber REV indication was associated to normal deployment of the blocker doors:
- do the following procedure.
- do the relevant procedure per (Ref. TSM TASK 78-31-00-810-869).
Subtask 78-31-00-810-129-A ** ON A/C NOT FOR ALL
A. This fault is generated when the deploy switches indication is intermittent or has failed when reverse is selected. This may cause the engine power to fluctuate between idle and full reverse thrust power.
(1) Do an inspection of the control levers of the thrust-reverser deploy switches and make sure that they operate smoothly AMM 78-31-17-210-040.
Subtask 78-31-00-710-185-A ** ON A/C NOT FOR ALL (1) Do an inspection of the control levers of the thrust-reverser deploy switches and make sure that they operate smoothly AMM 78-31-17-210-040.
NOTE: Most probable cause is seizure of the deploy switches control levers or intermittent electrical contact in the switches or in the associated harnesses or play between switch outer lever and bushing or outer lever pad damaged or missing or gap between pivot bolt and the bushing.
(a) If damage is found: - repair or replace as required.
- examine the Post Flight Report and Last Leg Report for fault messages DEPL SW, J5/J6, ECU or DEPLSTW, J5/J6, ECU.
- do the relevant trouble shooting procedure (Ref TSM CFDS ATA 78).
- do a check of the harnesses J5 and J6 and the thrust reverser harness from the ECU to the deploy switches for any damage, loose or contaminated connectors including the thrust reverser junction box.
- clean, retighten connectors or replace harnesses and beam harnesses as required AMM 71-51-44-000-002 and AMM 71-51-44-400-002
- replace the SW-BLOCKER DOOR DEPLOY, L [4103KS1] SW-BLOCKER DOOR DEPLOY, R [4103KS2] AMM 78-31-17-000-040 and AMM 78-31-17-400-040 or apply CMM 78-32-35 repair No. 29.
- replace the beam harnesses AMM 78-31-17-000-041 and AMM 78-31-17-400-041.
- Replace the hardware AMM 78-32-41-000-040 and AMM 78-32-41-400-040 or AMM 78-32-41-000-041 and AMM 78-32-41-400-041, or apply CMM 78-32-35 repair No. 29.
B. Do an operational test of the thrust reverser AMM 78-31-00-710-040 and make sure that the ECAM REV indication is correct. (Amber in transit then green when reverser blocker doors are fully deployed).
Subtask 78-31-00-810-129-B ** ON A/C NOT FOR ALL C. This fault is generated when the deploy switches indication is intermittent or has failed when reverse is selected. This may cause the engine power to fluctuate between idle and full reverse thrust power.
(1) Do an inspection of the control levers of the thrust-reverser deploy switches and make sure that they operate smoothly AMM 78-31-17-210-001.
Subtask 78-31-00-710-185-B ** ON A/C NOT FOR ALL (1) Do an inspection of the control levers of the thrust-reverser deploy switches and make sure that they operate smoothly AMM 78-31-17-210-001.
NOTE: Most probable cause is seizure of the deploy switches control levers or intermittent electrical contact in the switches or in the associated harnesses or play between switch outer lever and bushing or outer lever pad damaged or missing or gap between pivot bolt and the bushing.
(a) If damage is found: - repair or replace as required.
- examine the Post Flight Report and Last Leg Report for fault messages DEPL SW, J5/J6, ECU or DEPLSTW, J5/J6, ECU.
- do the relevant trouble shooting procedure (Ref TSM CFDS ATA 78).
- do a check of the harnesses J5 and J6 and the thrust reverser harness from the ECU to the deploy switches for any damage, loose or contaminated connectors including the thrust reverser junction box.
- clean, retighten connectors or replace harnesses and beam harnesses as required AMM 71-51-43-000-049 and AMM 71-51-43-400-049
- replace the SW-BLOCKER DOOR DEPLOY, L [4103KS1] SW-BLOCKER DOOR DEPLOY, R [4103KS2] AMM 78-31-17-000-001 and AMM 78-31-17-400-001 or apply CMM 78-32-36 repair No. 46.
- replace beam harnesses AMM 78-31-17-000-002 and AMM 78-31-17-400-002.
- Replace the hardware AMM 78-32-41-000-001 and AMM 78-32-41-400-001 or AMM 78-32-41-000-002 and AMM 78-32-41-400-002, or apply CMM 78-32-36 repair No. 46.
D. Do an operational test of the thrust reverser AMM 78-31-00-710-042 and make sure that the ECAM REV indication is correct. (Amber in transit then green when reverser blocker doors are fully deployed).