Failure of the LGCIU Signal to the BCL1

TASK 24-38-00-810-817-A
Failure of the LGCIU Signal to the BCL1

1. Possible Causes

LGCIU-1 [5GA1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 24-38-00-710-001	Operational Test of the Battery Charge Limiter (BCL), (with the CFDS)
AMM 32-31-71-000-001	Removal of the LGCIU
AMM 32-31-71-400-001	Installation of the LGCIU
AMM 32-69-00-740-001	BITE Check of Landing-Gear Control Interface-Unit (LGCIU) With Use of MCDU to Ensure that Continuous BITE is Operative

3. Fault Confirmation
Subtask 24-38-00-700-050-A

A. Test
Do the operational test of the BCL1 AMM 24-38-00-710-001.
(1) If the test gives the message BCL1 : LGCIU/ADIRU1 SIGNAL DISAGREE:

do the BITE test of the landing gear AMM 32-69-00-740-001.

(a) If the test gives the maintenance message LGCIU1:
- do the trouble shooting given in the fault isolation.
(b) If the test gives another maintenance message:

do the related trouble shooting.

4. Fault Isolation
Subtask 24-38-00-810-066-A

A. Procedure
(1) If the test confirms the fault:

swap the LGCIU1 and the LGCIU2 AMM 32-31-71-000-001 and AMM 32-31-71-400-001.

(2) If the fault moves to the other LGCIU position:

swap back the LGCIU1 and the LGCIU2 and replace the LGCIU-1 [5GA1] AMM 32-31-71-000-001 and AMM 32-31-71-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:26:48 UTC