DOC AIRBUS | TSM A320FFailure of the CFDIU Detected by the VHF 1
TASK 31-32-00-810-871-A
Failure of the CFDIU Detected by the VHF 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 31-32-00-865-119-A
Subtask 31-32-00-810-120-B
[Rev.8 from Aug 2018]
2026.04.04 04:29:53 UTC
Failure of the CFDIU Detected by the VHF 1
1. Possible Causes
- CFDIU [1TW]
- wiring
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 23-12-00-740-001 | BITE Test of the VHF System |
| ASM 313202 | |
| AMM 31-32-34-000-001 | Removal of the CFDIU |
| AMM 31-32-34-400-001 | Installation of the CFDIU |
Subtask 31-32-00-865-119-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 31-32-00-740-186-A 4. Fault Isolation| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | COM/VHF/1 | 2RC1 | G09 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | COM NAV/VHF/1 | 2RC1 | G09 |
Subtask 31-32-00-810-120-B
A. If the test gives the maintenance message CFDIU (1TW)/VHF1 (1RC1):
Subtask 31-32-00-740-187-A - replace the CFDIU [1TW] , AMM 31-32-34-000-001 and AMM 31-32-34-400-001.
- do a check and repair the wiring from the CFDIU (1TW) pins AA/2B, 2C to the first terminal block , ASM 313202.
B. Do the test given in Para. 3.B.