DOC AIRBUS | TSM A320FFailure of the CFDIU Detected by the HF 1
TASK 31-32-00-810-854-A
Failure of the CFDIU Detected by the HF 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 31-32-00-865-102-A
Subtask 31-32-00-810-103-C ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:29:51 UTC
Failure of the CFDIU Detected by the HF 1
1. Possible Causes
- CFDIU [1TW]
- wiring
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 23-11-00-740-001 | BITE Test of the HF System |
| ASM 313202 | |
| AMM 31-32-34-000-001 | Removal of the CFDIU |
| AMM 31-32-34-400-001 | Installation of the CFDIU |
Subtask 31-32-00-865-102-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 31-32-00-740-156-A ** ON A/C NOT FOR ALL Subtask 31-32-00-740-156-C ** ON A/C NOT FOR ALL 4. Fault Isolation| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | COM HF1 | 1RE1 | HA14 |
Subtask 31-32-00-810-103-C ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message CFDIU (1TW)/HF1 (3RE1):
Subtask 31-32-00-740-157-A ** ON A/C NOT FOR ALL - 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.
Subtask 31-32-00-810-103-E ** ON A/C NOT FOR ALL C. If the test gives the maintenance message HF1 NO DATA FROM CFDIU:
Subtask 31-32-00-740-157-C ** ON A/C NOT FOR ALL - 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.
D. Do the test given in Para. 3.B.