DOC AIRBUS | TSM A320FCAPT MASTER WARN Pushbutton Switch Inoperative
TASK 31-53-00-810-971-A
CAPT MASTER WARN Pushbutton Switch Inoperative
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 31-53-00-700-056-A
Subtask 31-53-00-810-221-A
[Rev.8 from Aug 2018]
2026.04.04 04:30:22 UTC
CAPT MASTER WARN Pushbutton Switch Inoperative
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| ASM 315206 | |
| AMM 31-53-34-000-001 | Removal of the Flight Warning Computer (FWC) |
| AMM 31-53-34-400-001 | Installation of the Flight Warning Computer (FWC) |
Subtask 31-53-00-700-056-A
A. Not applicable, the fault is evident.
4. Fault IsolationSubtask 31-53-00-810-221-A
A. If the LT- MASTER WARN, CAPT (9WW1) is inoperative:
- Remove the FWC-1 AMM 31-53-34-000-001.
- do a check for a ground signal at pin AA/6F of the FWC-2:
- replace the FWC-2 [1WW2] AMM 31-53-34-000-001 and AMM 31-53-34-400-001.
- do a check and repair the wiring between the LT- MASTER WARN, CAPT (9WW1) pin A/D1 and the FWC-2 pin AA/6F ASM 315206.
- install the FWC-1 AMM 31-53-34-400-001.
- remove the FWC-2 AMM 31-53-34-000-001.
- do a check for a ground signal at pin AA/6F of the FWC-1:
- replace the FWC-1 [1WW1] AMM 31-53-34-000-001 and AMM 31-53-34-400-001.
- do a check and repair the wiring between the LT- MASTER WARN, CAPT (9WW1) pin A/D1 and the FWC-1 pin AA/6F ASM 315206.