MLG Door (LH) Does Not Open Fully

TASK 32-31-00-810-857-A
MLG Door (LH) Does Not Open Fully

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

2523GM
MLG (LH) door operating mechanism
MLG proximity sensor and target clearances
MLG (LH) door uplock units and pins
MLG (LH) door forward and aft fitting

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 32-12-00-710-002	Operational Test of the Main Landing Gear (MLG) Doors Ground-Opening-Mechanism
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 32-31-35-000-001	Removal of the MLG Door Actuating-Cylinder
AMM 32-31-35-400-001	Installation of the MLG Door 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
AMM 52-81-00-200-001	Detailed Inspection of MLG Door, Forward and Aft Fittings, LH/RH
MLG Door Actuator Minimum Fully Open Dimension

3. Fault Confirmation
Subtask 32-31-00-860-089-A

A. Test
(1) Do a check of the Post Flight Report:

if two CFDS L L/G DOOR OPEN PROX SNSR TGT POS messages related to the same door, for the same flight are shown
or
if the ECAM WARNING, GEAR NOT DOWNLOCKED with two L L/G DOOR OPEN PROX SNSR TGT POS CFDS messages related to the same door are shown
or
if the MLG door was not easy to open on the ground:

(a) Do the fault isolation procedure in Para 4.

4. Fault Isolation
Subtask 32-31-00-810-115-A

A. Procedure

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

(1) Do the operational test of the MLG doors AMM 32-12-00-710-002.
(2) Use the door-opening control handle to manually open the MLG (LH) door and make sure:

the door opens with gravity to the position at which the actuator is vertical
the door moves smoothly and continuously (there are no sudden changes of speed).

(3) Open the L/G door to the position at which the door actuator is vertical:

the time to travel from the door closed to the actuator vertical position, must not be more than 30 seconds
measure the time from when the L/G door starts to open until the L/G door is shown fully open on the wheel page.

(4) If the L/G door has not fully opened, make sure that:

the door can be pushed easily to the fully open position with only one hand
the door moves smoothly and continuously and there are no sudden changes of speed (hydraulic resistance only).

(5) Move the L/G door away from the fully open position approximately 30 degrees, and back to the fully open position to make sure that:

the door moves smoothly and continuously and there are no sudden changes of speed (hydraulic resistance only).

(6) With the L/G door open measure the dimension X, it must be a minimum of 385 mm (15.1575 in.).

MLG Door Actuator Minimum Fully Open Dimension

(7) If one or more of the tests in steps (2) to (6) are unsatisfactory, replace the 2523GM AMM 32-31-35-000-001 and AMM 32-31-35-400-001.
(8) If the fault continues, and no fault is found in steps (2) to (6):
(a) Do a detailed inspection of the MLG (LH) door operating mechanism, inspect the components for:

safety of attachment
damage
corrosion
oil leaks.

(9) Do the inspection of the MLG proximity sensor and target clearances AMM 32-31-73-200-001.
(10) Do the detailed visual inspection of the MLG (LH) door uplock units and pins AMM 32-31-00-200-001.
(11) Do the detailed visual inspection of the MLG (LH) door forward and aft fitting AMM 52-81-00-200-001.
(12) If a fault is found, correct as necessary.
(13) Do the functional test of the normal extension and retraction of the landing gear AMM 32-31-00-720-002.
(14) If it was necessary to do a gravity extension of the landing gear (because of the MLG door fault), do a functional check of the free-fall extension AMM 32-33-00-720-001.

5. Close-up
Subtask 32-31-00-942-058-A

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.

[Rev.8 from Aug 2018] 2026.04.04 04:40:14 UTC