DOC AIRBUS | TSM A320FLoss of the Bus Output from the Clock Detected by the AFS
TASK 31-21-00-810-803-A
Loss of the Bus Output from the Clock Detected by the AFS
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 31-21-00-865-051-A
Subtask 31-21-00-810-052-A
[Rev.8 from Aug 2018]
2026.04.04 04:29:48 UTC
Loss of the Bus Output from the Clock Detected by the AFS
1. Possible Causes
2. Job Set-up Information
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 |
| AMM 22-96-00-710-001 | Operational Test of the AFS |
| ASM 312101 |
Subtask 31-21-00-865-051-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 31-21-00-710-050-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | CLOCK/NORM/SPLY | 6FS | F11 |
B. Test
Do the operational test of the AFS AMM 22-96-00-710-001 and read the result for the FMGC 1 and the FMGC 2.
4. Fault IsolationDo the operational test of the AFS AMM 22-96-00-710-001 and read the result for the FMGC 1 and the FMGC 2.
Subtask 31-21-00-810-052-A
A. If the test gives the maintenance message AFS : CLOCK:
Subtask 31-21-00-710-051-A - replace the FMGC-1 [1CA1] , AMM 22-83-34-000-001 and AMM 22-83-34-400-001.
- replace the FMGC-2 [1CA2] .
- do a check and repair the wiring from the FMGC 1 (1CA1) pins AA/13F, 13G to the first terminal block , ASM 312101.
- do a check and repair the wiring from the FMGC 2 (1CA2) pins AA/13F, 13G to the first terminal block , ASM 312101.
B. Do the test given in Para. 3.B.