DOC AIRBUS | TSM A320FAVNCS SYS FAULT Warning Inoperative
TASK 21-26-00-810-824-A
AVNCS SYS FAULT Warning Inoperative
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 21-26-00-710-075-A
Subtask 21-26-00-810-063-A
[Rev.8 from Aug 2018]
2026.04.04 04:24:38 UTC
AVNCS SYS FAULT Warning Inoperative
1. Possible Causes
- AEVC [10HQ]
wiring between the AEVC (10HQ) and the SDAC-1 (1WV1) wiring between the AEVC (10HQ) and the SDAC-2 (1WV2) - SDAC-1 [1WV1]
- SDAC-2 [1WV2]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 21-26-00-710-001 | Operational Check of the Avionics Equipment Ventilation-System via MCDU |
| ASM 212602 | |
| AMM 31-55-34-000-001 | Removal of the SDAC |
| AMM 31-55-34-400-001 | Installation of the SDAC |
Subtask 21-26-00-710-075-A
A. Test
(1) Do the operational test of the avionics equipment ventilation from the Multipurpose Control and Display Unit (MCDU) AMM 21-26-00-710-001.
4. Fault Isolation(1) Do the operational test of the avionics equipment ventilation from the Multipurpose Control and Display Unit (MCDU) AMM 21-26-00-710-001.
Subtask 21-26-00-810-063-A
A. If the test gives the maintenance message CHECK SDAC - AEVC INTFC:
Subtask 21-26-00-710-076-A - make sure that there is no ground at pins AB/10A and AB/11A of the AEVC (10HQ)
- replace the AEVC [10HQ] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
- do a check and repair the
wiring between the AEVC (10HQ) and the SDAC-1 (1WV1) , pin AB/8A and pin AD/12C and/or do a check and repair thewiring between the AEVC (10HQ) and the SDAC-2 (1WV2) , pins AB/8A and AD/12C ASM 212602.
- replace the SDAC-1 [1WV1] and/or the SDAC-2 [1WV2] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
B. Do the operational test given in Para. 3.