DOC AIRBUS | TSM A320FLoss of the Bus from the GAPCU to the CFDIU
TASK 31-32-00-810-939-A
Loss of the Bus from the GAPCU to the CFDIU
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 31-32-00-740-308-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 31-32-00-810-191-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:29:59 UTC
Loss of the Bus from the GAPCU to the CFDIU
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 24-00-00-810-803-A | Circuit Breaker Tripped and/or C/B TRIPPED Warning |
| 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 31-32-00-740-009 | Read the AVIONICS STATUS on the MCDU |
| ASM 313206 | |
| AMM 31-32-34-000-001 | Removal of the CFDIU |
| AMM 31-32-34-400-001 | Installation of the CFDIU |
Subtask 31-32-00-740-308-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 31-32-00-810-191-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message NO GAPCU DATA:
Subtask 31-32-00-740-309-A ** ON A/C NOT FOR ALL - Do a check of the status of the C/B-BAT BUS/301PP/SPLY [11PB] .
- Do the trouble shooting procedure related to the tripped circuit breaker (Ref. TSM TASK 24-00-00-810-803).
- Replace the GAPCU [24XG] AMM 24-41-34-000-001 and AMM 24-41-34-400-001.
- Replace the CFDIU [1TW] AMM 31-32-34-000-001 and AMM 31-32-34-400-001.
- Do a check and repair the wiring between GAPCU (24XG) pins AA/8J, 8H and CFDIU (1TW) pins AA/6G, 6F ASM 313206.
B. Do the test given in Para. 3.A.