DOC AIRBUS | TSM A320FL/G Uplock or Downlock fault
TASK 32-31-00-810-836-A
L/G Uplock or Downlock fault
A. Referenced Information
3. Fault Confirmation
Subtask 32-31-00-720-050-A
Subtask 32-31-00-810-087-A
[Rev.8 from Aug 2018]
2026.04.04 04:31:22 UTC
L/G Uplock or Downlock fault
WARNING:
MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
WARNING:
MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. MOVEMENT OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
1. Possible Causes- aircraft wiring
[40GA] - Doors Operate Slowly
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 32-31-00-810-857-A | MLG Door (LH) Does Not Open Fully |
| TSM TASK 32-31-00-810-858-A | MLG Door (RH) Does Not Open Fully |
| TSM TASK 32-31-00-810-860-A | MLG Door (LH) Does Not Close Fully or Slow to Operate |
| TSM TASK 32-31-00-810-861-A | MLG Door (RH) Does Not Close Fully or Slow to Operate |
| AMM 32-31-00-720-002 | Functional Test of the Normal Extension and Retraction of the Landing Gear |
| ASM 323105 | |
| ASM 323106 | |
| AMM 32-31-12-000-001 | Removal of the Landing-Gear (L/G) Selector Valve |
| AMM 32-31-12-400-001 | Installation of the Landing-Gear (L/G) Selector Valve |
Subtask 32-31-00-720-050-A
A. Test
(1) Do the functional test of the landing gear AMM 32-31-00-720-002:
(a) If the L/G operated correctly during the functional test, do Para. 4.A.(1).
(b) If the L/G doors opened correctly, but the L/G did not operate correctly, do Para. 4.A.(2).
(c) If the MLG doors operate slowly, do Para. 4.A.(3).
4. Fault Isolation(1) Do the functional test of the landing gear AMM 32-31-00-720-002:
(a) If the L/G operated correctly during the functional test, do Para. 4.A.(1).
(b) If the L/G doors opened correctly, but the L/G did not operate correctly, do Para. 4.A.(2).
(c) If the MLG doors operate slowly, do Para. 4.A.(3).
Subtask 32-31-00-810-087-A
A. Procedure
(1) If the L/G operated correctly during the functional test:
(a) Get access to the ground scanning and do the trouble shooting procedure related to the maintenance message (Ref TSM 323100 PB 301).
(2) If the L/G doors opened correctly, but the L/G did not operate correctly:
(a) Get access the ground scanning and do the trouble shooting procedure related to the maintenance message (Ref TSM 323100 PB 301).
(b) If no fault messages are shown:
1 Do a check of the aircraft wiring for an open circuit between the selector valve (40GA) and the LGCIU-1 and LGCIU-2 ASM 323105 and ASM 323106.
2 If the wiring is OK, replace the
(3) The MLG Doors Operate Slowly .
(1) If the L/G operated correctly during the functional test:
(a) Get access to the ground scanning and do the trouble shooting procedure related to the maintenance message (Ref TSM 323100 PB 301).
(2) If the L/G doors opened correctly, but the L/G did not operate correctly:
(a) Get access the ground scanning and do the trouble shooting procedure related to the maintenance message (Ref TSM 323100 PB 301).
(b) If no fault messages are shown:
1 Do a check of the aircraft wiring for an open circuit between the selector valve (40GA) and the LGCIU-1 and LGCIU-2 ASM 323105 and ASM 323106.
2 If the wiring is OK, replace the
(3) The MLG Doors Operate Slowly .
NOTE: The MLG door movement must be smooth and continuous.
(a) If the ECAM warnings are NOT UPLOCKED and DOORS NOT CLOSED, do the applicable procedure for the MLG door that closes slowly: - for the left MLG door, do (Ref. TSM TASK 32-31-00-810-860)
- for the right MLG door, do (Ref. TSM TASK 32-31-00-810-861).
- for the left MLG door, do (Ref. TSM TASK 32-31-00-810-857)
- for the right MLG door, do (Ref. TSM TASK 32-31-00-810-858).