LGCIU Selection. Hardware/Control Determination.

TASK 32-31-00-810-804-A
LGCIU Selection. Hardware/Control Determination.

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

LGCIU-1 [5GA1]
LGCIU-2 [5GA2]
aircraft wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 32-31-00-440-002	Reactivation of the Landing Gear Control and Interface Unit (LGCIU) Number 2
ASM 323105
ASM 323106
AMM 32-31-71-000-001	Removal of the LGCIU
AMM 32-31-71-400-001	Installation of the LGCIU

3. Fault Confirmation
Subtask 32-31-00-710-052-A

A. Message Analysis
(1) Examine the Post Flight Report (PFR) to find the flight-phase and time-difference of the reported faults:
(a) If the LGCIU-1 and LGCIU-2 faults occurred during different flight phases:
1 Do the trouble shooting procedures related to the maintenance messages.
(b) If the LGCIU-1 and LGCIU-2 faults occurred at the same time:
1 Do the fault isolation procedure in Para. 4.A.

4. Fault Isolation
Subtask 32-31-00-865-052-A

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
121VU	LGCIU/BAT SPLY/SYS2	59GA	R33
121VU	LGCIU/BAT SPLY/SYS1	58GA	R32

Subtask 32-31-00-810-052-B

B. Procedure
(1) Open the C/Bs 2GA and 59GA. This will isolate LGCIU2.
(2) Wait for a minimum of 15 seconds.
(3) Open the C/Bs 1GA, 52GA and 58GA for a minimum of 15 seconds and then close them. This will cause the LGCIU1 to do a power-up BITE test.
(4) After 60 seconds, do a check of the UPPER ECAM and STATUS pages and make sure that the fault warnings go:

If the fault warnings go, do step (6)
If the fault warnings do not go, do the next step.

(5) Replace the LGCIU-1 [5GA1] , AMM 32-31-71-000-001 and AMM 32-31-71-400-001
AMM 32-31-00-440-002.
(6) Open the C/Bs 1GA, 52GA and 58GA. This will isolate the LGCIU1.
(7) Wait for a minimum of 15 seconds.
(8) Open the C/Bs 2GA and 59GA for a minimum of 15 seconds:
(9) Close the C/Bs 2GA and 59GA. This will cause the LGCIU2 to do a power-up BITE test.
(10) After 60 seconds, do a check of the UPPER ECAM and STATUS pages and make sure that the fault warnings go:

If the fault warnings do not go, do the next step.

(11) Replace the LGCIU-2 [5GA2] , AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
(12) If the fault continues:
(a) Do a check and repair of the aircraft wiring , between the LGCIU-1 [5GA1] and LGCIU-2 [5GA2] , ASM 323105 and ASM 323106.

LGCIU-1 pin AA14D to LGCIU-2 pin AA14F
LGCIU-1 pin AA15D to LGCIU-2 pin AA15F
LGCIU-1 pin AA14F to LGCIU-2 pin AA14D
LGCIU-1 pin AA15F to LGCIU-2 pin AA15D.

(13) Do the tests in Para. B. (1) to (4) and (6) to (10).

5. Close-up
Subtask 32-31-00-860-065-A

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:31:19 UTC