DOC AIRBUS | TSM A320FLoss of the FCU Data Input Bus on the ADIRU1 and ADIRU3
TASK 34-13-81-810-826-A
Loss of the FCU Data Input Bus on the ADIRU1 and ADIRU3
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 34-13-81-740-080-A 4. Fault Isolation
Subtask 34-13-81-810-075-B
[Rev.8 from Aug 2018]
2026.04.04 04:32:35 UTC
Loss of the FCU Data Input Bus on the ADIRU1 and ADIRU3
1. Possible Causes
- FCU [2CA]
- wiring
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 22-81-12-000-001 | Removal of the FCU |
| AMM 22-81-12-400-001 | Installation of the FCU |
| AMM 34-13-00-740-002 | INTERFACE TEST of the ADR |
| ASM 341302 |
Subtask 34-13-81-740-080-A 4. Fault Isolation
Subtask 34-13-81-810-075-B
A. If the test gives the maintenance messages FCU (2CA) /ADIRU1 (1FP1) and FCU (2CA) /ADIRU3 (1FP3):
Subtask 34-13-81-740-081-A - replace the FCU [2CA] AMM 22-81-12-000-001 and AMM 22-81-12-400-001.
- do a check and repair the wiring of the DIGITAL BARO CORRECTION A bus from the FCU (2CA) to the first terminal block ASM 341302.
B. Do the test given in Para. 3.