Loss of the LGCIU 1 or the LGCIU 2

TASK 30-31-00-810-856-A
Loss of the LGCIU 1 or the LGCIU 2

1. Possible Causes

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

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 301003
ASM 303101
ASM 303102
AMM 32-31-71-000-001	Removal of the LGCIU
AMM 32-31-71-400-001	Installation of the LGCIU
AMM 32-31-73-000-001	Removal of the MLG Proximity-Sensors
AMM 32-31-73-000-005	Removal of the NLG Proximity-Sensors
AMM 32-31-73-400-001	Installation of the MLG Proximity-Sensors
AMM 32-31-73-400-005	Installation of the NLG Proximity-Sensors
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 30-31-00-860-050-A

A. Get the CFDS MENU page as follows:
(1) Push in the line key adjacent to the CFDS indication. Make sure that the CFDS menu page comes into view.
(2) Push in the line key adjacent to the LAST LEG REPORT.
(a) If there are CFDS messages related to ATA chapter 32:

Refer to the para. 4.A.

(b) If there are CFDS messages related to ATA chapter 30.31:

Refer to the para. 4.B.

Refer to the para. 4.C.

4. Fault Isolation
Subtask 30-31-00-810-105-A

A. If the fault symptom is identified by the ECAM warnings:
. ANTI ICE CAPT PROBES
. ANTI ICE F/O PITOT
. ANTI ICE STBY PITOT
and the CFDS messages related to ATA chapter 32:

Do the bite test of the landing gear AMM 32-69-00-740-001.
replace the defective LGCIU-1 [5GA1] or LGCIU-2 [5GA2] AMM 32-31-71-000-001 AMM 32-31-71-400-001.

Subtask 30-31-00-810-111-A

B. If the fault symptom is identified by the ECAM warnings:
. ANTI ICE CAPT PROBES
. ANTI ICE F/O PITOT
. ANTI ICE STBY PITOT
and CFDS messages related to ATA chapter 30.31:

Refer to the related trouble shooting.

Subtask 30-31-00-810-112-A

C. If the fault symptom is identified by the ECAM warnings:
. ANTI ICE CAPT PROBES
. ANTI ICE F/O PITOT
. ANTI ICE STBY PITOT
(1) Do a check of the wiring from:

The PHC 1 (6DA1) pin A/<E to the LGCIU 1 (5GA1) pin AB/14A ASM 303101
The PHC 1 (6DA1) pin A/<D to the LGCIU 2 (5GA2) pin AB/14A
The PHC 2 (6DA2) pin E/<E to the LGCIU 1 (5GA1) pin AB/14E ASM 303102
The PHC 2 (6DA2) pin E/<D to the LGCIU 2 (5GA2) pin AB/14E
The PHC 3 (6DA3) pin A/<E to the LGCIU 1 (5GA1) pin AB/15A ASM 301003
The PHC 3 (6DA3) pin A/<D to the LGCIU 2 (5GA2) pin AB/15A.

(a) If the wiring is not correct:

Repair the wiring.

(b) If the wiring is correct:

Do the bite test of the landing gear AMM 32-69-00-740-001.
Replace the defective LGCIU-1 (5GA1) or LGCIU-2 (5GA2) AMM 32-31-71-000-001 and AMM 32-31-71-400-001.

Replace the proximity sensors AMM 32-31-73-000-001 and AMM 32-31-73-400-001 or AMM 32-31-73-000-005 and AMM 32-31-73-400-005.

[Rev.8 from Aug 2018] 2026.04.04 04:29:38 UTC