MLG (LH) Does Not Downlock

TASK 32-31-00-810-863-A
MLG (LH) Does Not Downlock

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.

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

1. Possible Causes

MLG (LH) proximity sensor and target clearances
MLG (LH) lockstay assembly
MLG (LH) downlock springs
ACTG CYL-MLG, L [2503GM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 32-11-00-200-001	General Visual Inspection of the Main Landing Gear
AMM 32-11-00-220-003	Detailed Dimensional Check of the MLG Lockstay Assembly
AMM 32-11-19-200-001	Visual Check of Landing Gear Downlock Springs and Attachments
AMM 32-31-00-200-001	Detailed Inspection of Gear Uplock and Door Uplock Units and Rollers
AMM 32-31-00-720-002	Functional Test of the Normal Extension and Retraction of the Landing Gear
AMM 32-31-46-000-001	Removal of the MLG Actuating Cylinder
AMM 32-31-46-400-001	Installation of the MLG Actuating Cylinder
AMM 32-31-73-200-001	Inspection of the MLG Proximity Sensor and Target Clearances
AMM 32-33-00-720-001	Functional Check of Free-Fall Extension

3. Fault Confirmation
Subtask 32-31-00-860-095-A

A. Procedure
(1) If it was necessary to do a gravity extension of the landing gear (because of the MLG (LH) downlock fault, do the Aircraft Configuration procedure AMM 32-33-00-720-001.
(2) Do a check of the post flight report:

If there is a L/G SYS DISAGREE ECAM message and related MLG (LH) downlock CFDS message
or
If there is a CFDS message MLG (LH) DOES NOT DOWNLOCK shown.

(a) Do the Fault Isolation procedure.

4. Fault Isolation
Subtask 32-31-00-810-121-A

A. Procedure

NOTE: The procedure that follows, gives the information necessary to identify mechanical faults related to the MLG (LH).

(1) Do the inspection/check of the main gear (LH) AMM 32-11-00-200-001.
(2) Do the inspection of the MLG (LH) proximity sensor and target clearances AMM 32-31-73-200-001.
(3) Do the detailed dimensional check of the MLG (LH) lockstay assembly AMM 32-11-00-220-003.
(4) Do the visual inspection of the MLG (LH) downlock springs AMM 32-11-19-200-001.
(5) Do the detailed visual inspection of the MLG (LH) uplock units and pins AMM 32-31-00-200-001.
(6) Correct any fault found.
(7) Do the functional test of the normal extension and retraction of the landing gear AMM 32-31-00-720-002.
(8) If the fault continues, the MLG (LH) is slow to operate or the fault continues after the subsequent flight, replace the ACTG CYL-MLG, L [2503GM] AMM 32-31-46-000-001 and AMM 32-31-46-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:31:24 UTC