L/G Door Fully Open Proximity Sensor TGT POS Fault (32GA thru 39GA)

TASK 32-31-00-810-840-A
L/G Door Fully Open Proximity Sensor TGT POS Fault (32GA thru 39GA)

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.

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

L/G Door To Slow To Operate
PROX SNSR-R L/G DOOR OPEN, SYS 1 [32GA]
PROX SNSR-L L/G DOOR OPEN, SYS 1 [33GA]
PROX SNSR-R L/G DOOR OPEN, SYS 2 [34GA]
PROX SNSR-L L/G DOOR OPEN, SYS 2 [35GA]
PROX SNSR-NLG R DOOR OPEN, SYS 1 [36GA]
PROX SNSR-NLG L DOOR OPEN, SYS 1 [37GA]
PROX SNSR-NLG R DOOR OPEN, SYS 2 [38GA]
PROX SNSR-NLG L DOOR OPEN, SYS 2 [39GA]
Aircraft wiring

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	INDUCTANCE METER 1KHZ

B. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 32-31-00-810-859-A	NLG Doors Do Not Close Fully or Slow to Operate
TSM TASK 32-31-00-810-860-A	MLG Door (LH) Does Not Close Fully or Slow to Operate
TSM TASK 32-31-00-810-861-A	MLG Door (RH) Does Not Close Fully or Slow to Operate
AMM 32-00-00-860-001	Flight Configuration Precautions with Electrical Power
AMM 32-12-00-010-001	Open the Main Gear Doors for Access
AMM 32-12-00-410-001	Close the Main Gear Doors after Access
AMM 32-22-00-010-001	Nose Gear Doors - Ground Doors Opening
AMM 32-22-00-410-001	Nose Gear Doors - Ground Doors Closing
ASM 323103
ASM 323104
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 32-31-73-200-001	Inspection of the MLG Proximity Sensor and Target Clearances
AMM 32-31-73-200-002	Inspection of the NLG Proximity Sensor and Target Clearances
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
AMM 32-31-73-820-009	Resistance Check of the Proximity Sensors

3. Fault Confirmation
Subtask 32-31-00-710-084-A

A. Message Analysis
(1) If a L/G DOOR OPEN TGT POS fault is shown on the Post Flight Report (PFR), on a set of sensors at the same time (+/- 1 minute), then the fault is L/G Door To Slow To Operate. In this condition, do the trouble shooting as follows:

For NLG Door Open Sensors (37GA and 39GA OR 36GA and 38GA) do the (Ref. TSM TASK 32-31-00-810-859)
for LH MLG Door Open Sensors (33GA and 35GA) do the (Ref. TSM TASK 32-31-00-810-860)
for RH MLG Door Open Sensors (32GA and 34GA) do the (Ref. TSM TASK 32-31-00-810-861).

(2) If a L/G DOOR OPEN TGT POS fault is shown on the PFR on one sensor but not on a set of sensors. Record which LGCIU reported the fault and do the next step.

Subtask 32-31-00-865-053-A

B. 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 32-31-00-710-058-A

C. Test
(1) Open the the applicable NLG doors AMM 32-22-00-010-001, or MLG door AMM 32-12-00-010-001, related to the proximity sensor shown on the PFR.

NOTE: After an adjustment has been done, it is a good procedure to cycle the doors one time only. This will show if the adjustment has had the necessary effect.

(2) Do the flight configuration precautions AMM 32-00-00-860-001, and make sure that all the aircraft systems are in the ground configuration.
(3) Open the circuit breaker(s) (C/B) which supply the LGCIU in the opposite system to the proximity-sensor shown on the PFR.

for proximity sensors, 32GA, 33GA, 36GA and 37GA, open, safety and tag the circuit breaker 2GA, to make sure LGCIU 1 controls the L/G
for proximity sensors 34GA, 35GA, 38GA and 39GA, open, safety and tag the circuit breakers 1GA and 52GA, to make sure LGCIU 2 controls the L/G.

(4) At the ECAM Control Unit, set the WHEEL page.
(a) At the lower ECAM DU, make sure the wheel page shows that all the L/G doors are fully open:

if the applicable door symbol is not correct, do the fault isolation procedure in Para. 4.A.
if the fault condition shows in flight, but not on the ground, do the fault isolation procedure from Para. 4.A.(4)
if after maintenance work the applicable door symbol is correct, do the next step (5).

NOTE: When the L/G doors are fully open, the door symbol on the wheel page is shown (amber) in a position which is more than 90 degrees from the closed position.

(5) Return the aircraft to its intial condition:
(a) Close the C/B(s) opened in step (3).
(b) Close the L/G door(s) opened in step (1), AMM 32-12-00-410-001 or AMM 32-22-00-410-001.

4. Fault Isolation
Subtask 32-31-00-810-092-A

A. Procedure
(1) For the applicable proximity sensor shown on the PFR, do the Inspection of the MLG and NLG Proximity Sensor and Target Clearances, AMM 32-31-73-200-001 or AMM 32-31-73-200-002:

if no sensor/target clearance adjustment is necessary, do the step (3)
if a sensor/target clearance is adjusted, do the step (2).

(2) Do the test in Para. 3.B:

if the fault continues do the next step.

(3) Do a check of the resistance of the applicable proximity sensor AMM 32-31-73-820-009:

if the resistance values are correct, do the next step
if one or more of the resistance values is not correct, do the step (5).

(4) Use an INDUCTANCE METER 1KHZ to do a check of the inductance of the applicable proximity sensor AMM 32-31-73-820-008:

if the inductance is correct, do the step (7)
if the inductance is not correct, do the step (5).

(5) Replace the applicable proximity sensor, shown on the PFR:

for PROX SNSR-R L/G DOOR OPEN, SYS 1 [32GA] and PROX SNSR-L L/G DOOR OPEN, SYS 1 [33GA] , AMM 32-31-73-000-001 and AMM 32-31-73-400-001
for PROX SNSR-R L/G DOOR OPEN, SYS 2 [34GA] , PROX SNSR-L L/G DOOR OPEN, SYS 2 [35GA] , AMM 32-31-73-000-001 and AMM 32-31-73-400-001
for PROX SNSR-NLG R DOOR OPEN, SYS 1 [36GA] or PROX SNSR-NLG L DOOR OPEN, SYS 1 [37GA] , AMM 32-31-73-000-005 and AMM 32-31-73-400-005
for PROX SNSR-NLG R DOOR OPEN, SYS 2 [38GA] or PROX SNSR-NLG L DOOR OPEN, SYS 2 [39GA] , AMM 32-31-73-000-005 and AMM 32-31-73-400-005.

(6) Use an INDUCTANCE METER 1KHZ to do a check of the inductance of the new replacement sensor AMM 32-31-73-820-008:

if the inductance is correct, do the next step
if the inductance is not correct, do the step (8).

(7) Do the test in Para 3.C:

if the fault continues, do the next step.

(8) Replace the applicable LGCIU-1 (5GA1) or LGCIU-2 (5GA2) which identified the fault, AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
(9) Do a check of and repair as necessary, the Aircraft wiring between the:

electrical connectors on the applicable proximity sensor and related LGCIU Arinc tray ASM 323103 or ASM 323104.

(10) Do the test in para 3.C.

5. Close-up
Subtask 32-31-00-942-065-A

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:31:23 UTC