DOC AIRBUS | TSM A320FAVIONICS SYSTEM FAULT ECAM Warning Unwanted or Inoperative
TASK 21-26-00-810-812-A
AVIONICS SYSTEM FAULT ECAM Warning Unwanted or Inoperative
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 21-26-00-865-075-A
Subtask 21-26-00-810-074-A
[Rev.8 from Aug 2018]
2026.04.04 04:24:37 UTC
AVIONICS SYSTEM FAULT ECAM Warning Unwanted or Inoperative
1. Possible Causes
- AEVC [10HQ]
- SDAC-1 [1WV1]
- SDAC-2 [1WV2]
wiring between the AEVC (10HQ) and the SDAC-1 (1WV1) wiring between the AEVC (10HQ) and the SDAC-2 (1WV2)
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 21-26-00-710-001 | Operational Check of the Avionics Equipment Ventilation-System via MCDU |
| AMM 21-26-00-710-008 | Operational Test to Read the CFDS for CLASS 3 Faults of the AEVC |
| AMM 21-26-00-710-009 | Operational Test to Read the CFDS for LAST LEG REPORT of the AEVC |
| ASM 212602 | |
| AMM 21-26-34-000-001 | Removal of the Avionics Equipment Ventilation Computer (AEVC) |
| AMM 21-26-34-400-001 | Installation of the Avionics Equipment Ventilation Computer (AEVC) |
| AMM 31-55-34-000-001 | Removal of the SDAC |
| AMM 31-55-34-400-001 | Installation of the SDAC |
Subtask 21-26-00-865-075-A
A. Table of the circuit breakers used in this procedure:
Subtask 21-26-00-710-094-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 122VU | AIR COND/AVNCS/VENT/MONG | 3HQ | Y17 |
B. Test
(1) Do the reset of the AEVC (10HQ).
(a) Open the circuit breaker AIR COND/AVNCS/VENT/MONG (3HQ).
(b) Wait for five seconds.
(c) Close the circuit breaker AIR COND/AVNCS/VENT/MONG (3HQ).
(2) Do the operational test of the avionics equipment ventilation from the Multipurpose Control and Display Unit (MCDU) AMM 21-26-00-710-001.
(3) Read the LAST LEG REPORT of the AEVC AMM 21-26-00-710-009.
(4) Read the CLASS 3 faults of the AEVC AMM 21-26-00-710-008.
4. Fault Isolation(1) Do the reset of the AEVC (10HQ).
(a) Open the circuit breaker AIR COND/AVNCS/VENT/MONG (3HQ).
(b) Wait for five seconds.
(c) Close the circuit breaker AIR COND/AVNCS/VENT/MONG (3HQ).
(2) Do the operational test of the avionics equipment ventilation from the Multipurpose Control and Display Unit (MCDU) AMM 21-26-00-710-001.
(3) Read the LAST LEG REPORT of the AEVC AMM 21-26-00-710-009.
(4) Read the CLASS 3 faults of the AEVC AMM 21-26-00-710-008.
Subtask 21-26-00-810-074-A
A. If the test gives the maintenance message GND AEVC:
Subtask 21-26-00-710-095-A - Replace the AEVC [10HQ] AMM 21-26-34-000-001 and AMM 21-26-34-400-001.
- Replace the SDAC-1 [1WV1] and the SDAC-2 [1WV2] 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) and thewiring between the AEVC (10HQ) and the SDAC-2 (1WV2) , pins AB/8A and pins AD/12C ASM 212602.
B. Do the operational test given in Para. 3.