DOC AIRBUS | TSM A320FLoss of the FCU 2 B Bus
TASK 22-81-00-810-807-A
Loss of the FCU 2 B Bus
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 22-81-00-710-061-A 4. Fault Isolation
Subtask 22-81-00-810-058-A
[Rev.8 from Aug 2018]
2026.04.04 04:25:25 UTC
Loss of the FCU 2 B Bus
1. Possible Causes
- FCU [2CA]
wiring of the FCU 2 B bus from the FCU (2CA) to the first terminal block
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 24-00-00-810-818-A | Computer Reset |
| AMM 22-81-12-000-001 | Removal of the FCU |
| AMM 22-81-12-400-001 | Installation of the FCU |
| ASM 228603 | |
| AMM 22-91-00-710-001 | Ground Scanning of the AFS |
Subtask 22-81-00-710-061-A 4. Fault Isolation
Subtask 22-81-00-810-058-A
A. If the test gives the maintenance message AFS: FCU:
Subtask 22-81-00-710-062-A - do a FCU reset procedure (Ref. TSM TASK 24-00-00-810-818).
NOTE: The 7 minute reset is necessary to do a full test sequence of the FCU.
(1) If the fault continues: - 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 FCU 2 B bus from the FCU (2CA) to the first terminal block ASM 228603.
B. Do the test given in Para. 3.