DOC AIRBUS | TSM A320FFailure of the CFDIU Detected by the AMU
TASK 31-32-00-810-859-A
Failure of the CFDIU Detected by the AMU
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 31-32-00-865-107-A
Subtask 31-32-00-810-108-A
[Rev.8 from Aug 2018]
2026.04.04 04:29:52 UTC
Failure of the CFDIU Detected by the AMU
1. Possible Causes
- CFDIU [1TW]
- wiring
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 23-51-00-740-002 | BITE Test of the Audio System |
| ASM 313205 | |
| AMM 31-32-34-000-001 | Removal of the CFDIU |
| AMM 31-32-34-400-001 | Installation of the CFDIU |
Subtask 31-32-00-865-107-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 31-32-00-740-162-A 4. Fault Isolation| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | COM/AUDIO/FLT/INTPH | 9RN | G08 |
| 49VU | COM/AUDIO/ACP/F/O | 5RN | G07 |
| 49VU | COM/AUDIO/ACP/CAPT | 4RN | G06 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | INT 1 + 2 | 9RN | G08 |
| 49VU | ACP F/O BITE INT 2 AUDIO 3/5 OCCPNT | 5RN | G07 |
| 49VU | ACP CAPT SELCAL INT 1 AUDIO AVNCS | 4RN | G06 |
| ** ON A/C ALL | |||
| 121VU | COM NAV/SELCAL | 8RN | M04 |
| 121VU | COM NAV/ACP/THIRD/OCCPNT | 6RN | M02 |
Subtask 31-32-00-810-108-A
A. If the test gives the maintenance message AUDIO NO DATA FROM CFDIU:
Subtask 31-32-00-740-163-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 AB/11D, 11E to the first terminal block , ASM 313205.
B. Do the test given in Para. 3.B.