DOC AIRBUS | TSM A320FLoss of the Reception of the CLOCK Bus by one FMGC
TASK 22-83-00-810-838-A
Loss of the Reception of the CLOCK Bus by one FMGC
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 22-83-00-865-065-A
Subtask 22-83-00-810-104-A
[Rev.8 from Aug 2018]
2026.04.04 04:25:31 UTC
Loss of the Reception of the CLOCK Bus by one FMGC
1. Possible Causes
- FMGC-1 [1CA1]
wiring of the CLOCK bus from the FMGC 1 (1CA1) to the first terminal block - FMGC-2 [1CA2]
wiring of the CLOCK bus from the FMGC 2 (1CA2) to the first terminal block
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 22-83-34-000-001 | Removal of the FMGC |
| AMM 22-83-34-400-001 | Installation of the FMGC |
| ASM 228601 | |
| AMM 22-91-00-710-001 | Ground Scanning of the AFS |
Subtask 22-83-00-865-065-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 22-83-00-710-108-A 4. Fault Isolation| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | CLOCK/NORM/SPLY | 6FS | F11 |
| 121VU | CLOCK/STBY/SPLY | 4FS | N02 |
Subtask 22-83-00-810-104-A
A. If the test gives the maintenance message AFS: CLOCK (ISSUED BY: FM1):
Subtask 22-83-00-810-105-A - replace the FMGC-1 [1CA1] AMM 22-83-34-000-001 and AMM 22-83-34-400-001.
- do a check and repair the
wiring of the CLOCK bus from the FMGC 1 (1CA1) to the first terminal block ASM 228601.
B. If the test gives the maintenance message AFS: CLOCK (ISSUED BY: FM2):
Subtask 22-83-00-710-109-A - replace the FMGC-2 [1CA2] AMM 22-83-34-000-001 and AMM 22-83-34-400-001.
- do a check and repair the
wiring of the CLOCK bus from the FMGC 2 (1CA2) to the first terminal block ASM 228601.
C. Do the test given in Para. 3.