DOC AIRBUS | TSM A320FCargo Door (Aft) Safety Mechanism Proximity Sensor Fault (32WV)
TASK 32-31-00-810-833-A
Cargo Door (Aft) Safety Mechanism Proximity Sensor Fault (32WV)
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 32-31-00-740-074-A
Subtask 32-31-00-810-084-A
Subtask 32-31-00-860-083-A
[Rev.8 from Aug 2018]
2026.04.04 04:31:22 UTC
Cargo Door (Aft) Safety Mechanism Proximity Sensor Fault (32WV)
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 Causes2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | MULTIMETER - STANDARD |
| No specific | AR | TESTER - INSULATION RESISTANCE |
| 38-368-02 | 1 | UNIT-TEST,SENSOR |
| 38-368-03 | 1 | UNIT-TEST,SENSOR |
| REFERENCE | DESIGNATION |
|---|---|
| ASM 315400 | |
| 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 |
| AMM 52-71-12-000-002 | Removal of the Proximity Switches |
| AMM 52-71-12-400-002 | Installation of the Proximity Switches |
| TSM TASK 32-31-00-03 | NORMAL EXTENSION AND RETRACTION - TASK SUPPORTING DATA |
Subtask 32-31-00-740-074-A
A. Test
(1) Do a BITE test on the LGCIU-1 AMM 32-69-00-740-001:
(a) Access LGCIU-1 TROUBLE SHOOTING (ground) and read the BITE test fault number(s) for fault confirmation (refer to TSM 323100 PB 301).
4. Fault Isolation(1) Do a BITE test on the LGCIU-1 AMM 32-69-00-740-001:
(a) Access LGCIU-1 TROUBLE SHOOTING (ground) and read the BITE test fault number(s) for fault confirmation (refer to TSM 323100 PB 301).
NOTE: The table shows the CFDS FAULT message.
(2) Do the fault isolation. Subtask 32-31-00-810-084-A
A. Cargo Compartment Control
(2) If the BITE test shows a proximity sensor fault, do the steps that follow:
(a) At the applicable proximity sensor, release the electrical-connector.
(b) If the 38-368-02 UNIT-TEST,SENSOR or the 38-368-03 UNIT-TEST,SENSOR is available, do the troubleshooting procedure of the proximity sensor32-31-00-03 TSM TASK 32-31-00-03 .
(3) Use the MULTIMETER - STANDARD and do a check of the resistance between pins A and B of the proximity sensor ASM 315400. Make sure that the resistance is:
(a) Connect pins A and B together.
(b) Connect one test lead of the TESTER - INSULATION RESISTANCE to pins AB and the other test lead to the case.
(c) Supply a test signal for five seconds and read the resistance value shown.
(d) Make sure that the resistance is more than 400 Megohms.
(5) If one of the two tests at Para. 4.A. (3) and (4) is unsatisfactory for the PROX SW-FRAME, AFT CARGO COMPT DOOR [32WV] :
(a) Replace the unserviceable proximity sensor AMM 52-71-12-000-002 and AMM 52-71-12-400-002.
(6) If the tests at Para. 4.A. (3) and (4) are satisfactory, then:
(a) Do a check of the wiring between the applicable proximity sensor electrical-connector and the LGCIU 1 ARINC tray.
(7) If there is no continuity repair the wiring/interface.
(8) Do the L/G BITE test as in Para. 3.A. (1).
(9) If no fault is found at Para. 4.A. (5):
(a) Replace the LGCIU-1 [5GA1] AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
(10) Do the GROUND SCANNING to check that there are no fault entries in the ground log.
5. Close-upNOTE: The PROX SW-FRAME, AFT CARGO COMPT DOOR [32WV] is installed on the aft cargo door.
(1) Refer to AMM 52-71-12-000-002 Figure 402/TASK 52-71-12-991-002-A and find the PROX SW-FRAME, AFT CARGO COMPT DOOR [32WV] . (2) If the BITE test shows a proximity sensor fault, do the steps that follow:
(a) At the applicable proximity sensor, release the electrical-connector.
(b) If the 38-368-02 UNIT-TEST,SENSOR or the 38-368-03 UNIT-TEST,SENSOR is available, do the troubleshooting procedure of the proximity sensor
(3) Use the MULTIMETER - STANDARD and do a check of the resistance between pins A and B of the proximity sensor ASM 315400. Make sure that the resistance is:
- Between 11 and 13 ohms for a ferrite proximity sensor (PN 8-484-01)
- Between 15 and 17 ohms for an all metal proximity sensor (PN 8-933-01).
(a) Connect pins A and B together.
(b) Connect one test lead of the TESTER - INSULATION RESISTANCE to pins AB and the other test lead to the case.
(c) Supply a test signal for five seconds and read the resistance value shown.
(d) Make sure that the resistance is more than 400 Megohms.
(5) If one of the two tests at Para. 4.A. (3) and (4) is unsatisfactory for the PROX SW-FRAME, AFT CARGO COMPT DOOR [32WV] :
(a) Replace the unserviceable proximity sensor AMM 52-71-12-000-002 and AMM 52-71-12-400-002.
(6) If the tests at Para. 4.A. (3) and (4) are satisfactory, then:
(a) Do a check of the wiring between the applicable proximity sensor electrical-connector and the LGCIU 1 ARINC tray.
(7) If there is no continuity repair the wiring/interface.
(8) Do the L/G BITE test as in Para. 3.A. (1).
(9) If no fault is found at Para. 4.A. (5):
(a) Replace the LGCIU-1 [5GA1] AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
(10) Do the GROUND SCANNING to check that there are no fault entries in the ground log.
Subtask 32-31-00-860-083-A
A. Put the aircraft back to its initial configuration.