L/G - NLG Shock Absorber Fault

TASK 32-31-00-810-851-A
L/G - NLG Shock Absorber Fault

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

NLG shock absorber is not aligned correctly
damage to the NLG linkage
PROX SNSR-NLG EXT, SYS 1 [24GA]
PROX SNSR-NLG EXT, SYS 2 [25GA]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 32-21-00-200-002	General Visual Inspection of the Nose Landing Gear
AMM 32-31-00-720-003	Functional Test of the Normal Extension and Retraction of the Nose Landing Gear
AMM 32-31-73-000-005	Removal of the NLG Proximity-Sensors
AMM 32-31-73-200-002	Inspection of the NLG Proximity Sensor and Target Clearances
AMM 32-31-73-400-005	Installation of the NLG Proximity-Sensors
AMM 32-31-73-820-006	Adjustment of the NLG Extension/Steering Proximity Sensors

3. Fault Confirmation
Subtask 32-31-00-700-050-A

A. Analysis
(1) If the Post Flight Report (PFR) shows the ECAM Warning SHOCK ABSORBER FAULT with the the CFDS message AFS: LGCIU1(2)-FAC1(2) CKT, do the fault isolation procedure in Para.4.A.

4. Fault Isolation
Subtask 32-31-00-810-109-B

A. Procedure

NOTE: The maintenance message AFS:LGCIU1(2)-FAC1(2) CKT shows when the related NLG proximity sensors 24GA (25GA) sense that the NLG shock absorber is not aligned correctly and damage to the NLG linkage can have occurred. Usually the two messages are shown, one from each LGCIU, but it is possible that only one message is shown on the PFR.

(1) Do a General Visual inspection of the Nose Landing Gear AMM 32-21-00-200-002 and look for damage to the proximity switches, the NLG structure and its linkages:

if you do not find damage, do step (3)
if you find damage, do step (2)

(2) Do the necessary repairs to the NLG structure, then do the next step.
(3) Do the Inspection of the NLG Proximity Sensor and Target Clearances for the applicable proximity sensor AMM 32-31-73-200-002:

if the proximity sensor/target clearances are not correct, do step (5)
if the proximity sensor/target clearances are correct, do step (4).

(4) Replace the applicable NLG proximity sensor PROX SNSR-NLG EXT, SYS 1 [24GA] or PROX SNSR-NLG EXT, SYS 2 [25GA] , AMM 32-31-73-000-005 and AMM 32-31-73-400-005, in the system shown on the PFR:
(a) Do the test in step (6).
(5) Do the adjustment of the applicable proximity sensor AMM 32-31-73-820-006.
(6) Do the Functional Test of the Normal Extension and Retraction of the NLG AMM 32-31-00-720-003.

[Rev.8 from Aug 2018] 2026.04.04 04:31:23 UTC