Landing Gear Control and Interface Unit (LGCIU) fault

TASK 23-73-00-810-973-A
Landing Gear Control and Interface Unit (LGCIU) fault

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 237300
AMM 23-73-00-740-005	BITE-Test of the Cabin Intercommunication Data System (CIDS) through the CFDS
AMM 23-73-34-000-001	Removal of the CIDS Director
AMM 23-73-34-400-001	Installation of the CIDS Director
AMM 32-31-71-000-001	Removal of the LGCIU
AMM 32-31-71-400-001	Installation of the LGCIU

3. Fault Confirmation
Subtask 23-73-00-700-060-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the Interface and Power-Up test of the Cabin Intercommunication Data System (CIDS) through the CFDS.
AMM 23-73-00-740-005

4. Fault Isolation
Subtask 23-73-00-810-769-A ** ON A/C NOT FOR ALL

A. If the test confirms the fault:

(1) Do a check and repair the wiring between:

the DIR-CIDS, 1 [101RH] connector AB pin 7F and the LGCIU-1 [5GA1] connector AA pin 11K,
the DIR-CIDS, 1 [101RH] connector AB pin 7F and the LGCIU-2 [5GA2] connector AA pin 11K,
the DIR-CIDS, 2 [102RH] connector AB pin 7F and the LGCIU-1 [5GA1] connector AA pin 11K,
the DIR-CIDS, 2 [102RH] connector AB pin 7F and the LGCIU-2 [5GA2] connector AA pin 11K,
ASM 237300.
install the DIR-CIDS, 1 [101RH] and DIR-CIDS, 2 [102RH] AMM 23-73-34-400-001.
install the LGCIU-1 [5GA1] LGCIU-2 [5GA2] AMM 32-31-71-400-001.

5. Close-up
Subtask 23-73-00-710-396-A ** ON A/C NOT FOR ALL

A. Do the test given in para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:26:02 UTC