DOC AIRBUS | TSM A320FFailure of the A629 BUS detected by the Upper ECAM DU
TASK 31-63-81-810-958-A
Failure of the A629 BUS detected by the Upper ECAM DU
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 31-63-81-720-068-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 31-63-81-810-242-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:31:09 UTC
Failure of the A629 BUS detected by the Upper ECAM DU
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 31-60-00-720-002 | Operational Test of the DMC/DU data bus |
| ASM 316104 | |
| AMM 31-63-22-000-001 | Removal of the Display Unit |
| AMM 31-63-22-400-001 | Installation of the Display Unit |
| AMM 31-63-34-000-001 | Removal of the DMC |
| AMM 31-63-34-400-001 | Installation of the DMC |
Subtask 31-63-81-720-068-A ** ON A/C NOT FOR ALL 4. Fault Isolation
Subtask 31-63-81-810-242-A ** ON A/C NOT FOR ALL
A. If the test gives:
(1) the maintenance message DU EWD (4WT1)/WRG: DMC1 BUS DATA TO EWD
Subtask 31-63-81-720-069-A ** ON A/C NOT FOR ALL (1) the maintenance message DU EWD (4WT1)/WRG: DMC1 BUS DATA TO EWD
- replace the DU-ECAM, UPPER [4WT1] AMM 31-63-22-000-001 and AMM 31-63-22-400-001.
- check the wiring between the DMC1 and the Upper ECAM DU (4WT1) ASM 316104.
- replace the DMC-1 [1WT1] AMM 31-63-34-000-001 and AMM 31-63-34-400-001.
- replace the DU-ECAM, UPPER [4WT1] AMM 31-63-22-000-001 and AMM 31-63-22-400-001.
- check the wiring between the DMC3 and the Upper ECAM DU (4WT1) ASM 316104.
- replace the DMC-3 [1WT3] AMM 31-63-34-000-001 and AMM 31-63-34-400-001.
B. Do the test given in Para. 3.