DOC AIRBUS | TSM A320FLoss of the FCU or FMGC output bus detected by the EIS
TASK 22-11-00-810-837-A
Loss of the FCU or FMGC output bus detected by the EIS
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 22-11-00-710-107-A 4. Fault Isolation
Subtask 22-11-00-810-093-A
[Rev.8 from Aug 2018]
2026.04.04 04:25:08 UTC
Loss of the FCU or FMGC output bus detected by the EIS
1. Possible Causes
computers related to the output buses from the FCU (FCU 1A & 1B/2A & 2B) and the FMGC 1 & 2 (FMGC OWN A & CB2) wiring of the Arinc Buses from the FCU (FCU 1A & 1B) wiring of the Arinc Buses from the FMGC 1 (FMGC OWN A & FMGC OWN CB2) wiring of the Arinc Busses from the FCU (FCU 2A & 2B) wiring of the Arinc Busses from the FMGC 2 (FMGC OWN A & FMGC OWN CB2)
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 31-32-00-810-934-A | Failure of the Digital Links |
| ASM 228602 | |
| ASM 228603 | |
| AMM 31-60-00-860-001 | EIS Start Procedure |
Subtask 22-11-00-710-107-A 4. Fault Isolation
Subtask 22-11-00-810-093-A
A. If one (CAPT or F/O) PFD shows ALT SEL flag and SPD SEL flag:
The digital links to be checked are the output buses from the FCU (FCU 1A & 1B/2A & 2B) and the FMGC 1 & 2 (FMGC OWN A & CB2) to the others LRUs.
(1) Use the Aircraft Schematic Manual (ASM) to find thecomputers related to the output buses from the FCU (FCU 1A & 1B/2A & 2B) and the FMGC 1 & 2 (FMGC OWN A & CB2) ASM 228603 and ASM 228602.
(a) Do a check for maintenance message related to the above computers on the Post Flight Report.
1 If there is a message:
(a) do a check and repair:
Subtask 22-11-00-710-108-A The digital links to be checked are the output buses from the FCU (FCU 1A & 1B/2A & 2B) and the FMGC 1 & 2 (FMGC OWN A & CB2) to the others LRUs.
(1) Use the Aircraft Schematic Manual (ASM) to find the
(a) Do a check for maintenance message related to the above computers on the Post Flight Report.
1 If there is a message:
- do the trouble shooting procedure related to the maintenance message.
- do the trouble shooting procedure (Ref. TSM TASK 31-32-00-810-934).
(a) do a check and repair:
- for flags on Capt PFD, the
wiring of the Arinc Buses from the FCU (FCU 1A & 1B) , ASM 228603 andwiring of the Arinc Buses from the FMGC 1 (FMGC OWN A & FMGC OWN CB2) , ASM 228602 to the others LRUs. - for flags on F/O PFD, the
wiring of the Arinc Busses from the FCU (FCU 2A & 2B) , ASM 228603 andwiring of the Arinc Busses from the FMGC 2 (FMGC OWN A & FMGC OWN CB2) , ASM 228602 to the others LRUs.
B. Do the test given in Para. 3.