DOC AIRBUS | TSM A320FLoss of the GAPCU Bus of the SDAC1
TASK 31-54-00-810-950-A
Loss of the GAPCU Bus of the SDAC1
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 31-54-00-710-331-A 4. Fault Isolation
Subtask 31-54-00-810-198-A
[Rev.8 from Aug 2018]
2026.04.04 04:30:34 UTC
Loss of the GAPCU Bus of the SDAC1
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 24-41-34-000-001 | Removal of the Ground Power Control Unit (GPCU) |
| AMM 24-41-34-400-001 | Installation of the Ground Power Control Unit (GPCU) |
| AMM 31-50-00-710-001 | Ground Scanning of the Central Warning System |
| ASM 315403 | |
| AMM 31-55-34-000-001 | Removal of the SDAC |
| AMM 31-55-34-400-001 | Installation of the SDAC |
Subtask 31-54-00-710-331-A 4. Fault Isolation
Subtask 31-54-00-810-198-A
A. If the test gives the maintenance message:
SDAC1: NO DATA FROM GAPCU
(1) Replace the SDAC-1 [1WV1] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
(2) If the fault continues:
do a check and repair the wiring between the GAPCU (24XG) to the SDAC1 (1WV1) ASM 315403.
(a) GAPCU (24XG) connector AA/8J, 8H to the SDAC1 (1WV1) connector AB/10J, 10K.
(b) GAPCU (24XG) connector AA/8J, 7H to the SDAC1 (1WV1) connector AE/10A, 10B.
Subtask 31-54-00-710-332-A SDAC1: NO DATA FROM GAPCU
(1) Replace the SDAC-1 [1WV1] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
(2) If the fault continues:
- replace the GAPCU [24XG] AMM 24-41-34-000-001 and AMM 24-41-34-400-001.
do a check and repair the wiring between the GAPCU (24XG) to the SDAC1 (1WV1) ASM 315403.
(a) GAPCU (24XG) connector AA/8J, 8H to the SDAC1 (1WV1) connector AB/10J, 10K.
(b) GAPCU (24XG) connector AA/8J, 7H to the SDAC1 (1WV1) connector AE/10A, 10B.
B. Do the test given in Para. 3.