L/G SYS DISAGREE With No LGCIU BITE Message

TASK 32-31-00-810-888-A
L/G SYS DISAGREE With No LGCIU BITE Message

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

1. Possible Causes

PROX SNSR-NLG DOORS CLOSED, SYS 1 [30GA]
PROX SNSR-L L/G DOOR CLOSED, SYS 1 [27GA]
PROX SNSR-R L/G DOOR CLOSED, SYS 1 [26GA]
UPLOCK ASSY-NLG DOOR [2534GM]
UPLOCK ASSY-MLG DOOR, R [2520GM]
UPLOCK ASSY-MLG DOOR, L [2521GM]
PROX SNSR-NLG DOORS CLOSED, SYS 2 [31GA]
PROX SNSR-L L/G DOOR CLOSED, SYS 2 [29GA]
PROX SNSR-R L/G DOOR CLOSED, SYS 2 [28GA]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-32-00-860-009	Procedure to Get Access to the SYSTEM REPORT/TEST/L/G Page
AMM 32-00-00-860-001	Flight Configuration Precautions with Electrical Power
AMM 32-31-14-000-001	Removal of the NLG Door Uplock Assy
AMM 32-31-14-400-001	Installation of the NLG Door Uplock Assy
AMM 32-31-33-000-001	Removal of the MLG Door Uplock 2520GM
AMM 32-31-33-400-002	Installation of the MLG Door Uplock 2520GM
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 32-31-73-820-008	Inductance Check of the Proximity Sensors/Switches

3. Fault Confirmation
Subtask 32-31-00-710-077-A

A. Test
(1) Before the L/G doors are opened for maintenance:
(a) Get access to the L/G SYSTEM/REPORT/TEST L/G page AMM 31-32-00-860-009.
(b) Do a check of the LAST LEG REPORT and the GROUND SCANNING of LGCIU 1 and 2.
(c) If a fault message is shown do the applicable troubleshooting procedure.

NOTE: If the L/G doors are opened for maintenance before you get access to the LGCIU LAST LEG REPORT and the GROUND SCANNING. A message unrelated to the defect will be shown.

NOTE: The ECAM WARNING "L/G SYS DISAGREE" is inhibited during flight phases, 03, 04, 05, 07 and 08.

(2) If no maintenance message is shown:
(a) Do the trouble shooting from Para. 4.

4. Fault Isolation
Subtask 32-31-00-865-065-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

Subtask 32-31-00-810-150-A

B. Procedure
(1) Make sure that all the L/G doors are in the closed position.
(2) Do the flight configuration precautions, AMM 32-00-00-860-001, make sure the aircraft has ground electrical power.
(3) To put LGCIU 1 in control:
(a) Make sure C/B's 1GA and 52GA are closed and open the C/B 2GA.
(b) On the ECAM WHEEL PAGE make sure that the L/G door indication shows all the doors closed.
(4) If the L/G door indication is correct, go to step (12).
(5) If a L/G door indication does not show closed:
(a) Do an inductance test of the applicable proximity sensor AMM 32-31-73-820-008:

for the NLG door PROX SNSR-NLG DOORS CLOSED, SYS 1 [30GA]
for the L MLG door PROX SNSR-L L/G DOOR CLOSED, SYS 1 [27GA]
for the R MLG door PROX SNSR-R L/G DOOR CLOSED, SYS 1 [26GA] .

(6) If no defect is found continue at step (12).
(7) If a defect is found, replace the applicable proximity sensor:

for a NLG door proximity sensor AMM 32-31-73-000-005 and AMM 32-31-73-400-005
for a MLG door proximity sensor AMM 32-31-73-000-001 and AMM 32-31-73-400-001.

(8) Do the test in steps (1) thru (3) again.
(9) If the fault continues:
(a) Replace the applicable uplock:

for UPLOCK ASSY-NLG DOOR [2534GM] , AMM 32-31-14-000-001 and AMM 32-31-14-400-001
for UPLOCK ASSY-MLG DOOR, R [2520GM] or UPLOCK ASSY-MLG DOOR, L [2521GM] , AMM 32-31-33-000-001 and AMM 32-31-33-400-002.

(10) Do the test in steps (1) thru (3)again.
(11) Close the C/B 2GA.

(12) To troubleshoot System 2:
(a) Make sure that all the L/G doors are in the closed position.
(b) Do the flight configuration precautions, AMM 32-00-00-860-001, make sure the aircraft has electrical power.
(13) To put LGCIU 2 in control:
(a) Make sure C/B 2GA is closed and open the C/B's 1GA and 52GA.
(b) On the ECAM WHEEL PAGE make sure that the L/G door indication shows all the doors closed.
(14) If a L/G door indication does not show closed:
(a) Do an inductance test of the applicable proximity sensor AMM 32-31-73-820-008:

for the NLG door PROX SNSR-NLG DOORS CLOSED, SYS 2 [31GA]
for the L MLG door PROX SNSR-L L/G DOOR CLOSED, SYS 2 [29GA]
for the R MLG door PROX SNSR-R L/G DOOR CLOSED, SYS 2 [28GA] .

(15) Replace the defective proximity sensor:

for a NLG door proximity sensor AMM 32-31-73-000-005 and AMM 32-31-73-400-005
for a MLG door proximity sensor AMM 32-31-73-000-001 and AMM 32-31-73-400-001.

(16) Do the test in steps (12) and (13)again.
(17) If the fault continues:
(a) Replace the applicable uplock:

for UPLOCK ASSY-NLG DOOR [2534GM] , AMM 32-31-14-000-001 and AMM 32-31-14-400-001
for UPLOCK ASSY-MLG DOOR, R [2520GM] or UPLOCK ASSY-MLG DOOR, L [2521GM] , AMM 32-31-33-000-001 and AMM 32-31-33-400-002.

(18) Do the test in steps (12) and (13)again.

[Rev.8 from Aug 2018] 2026.04.04 04:31:27 UTC