AVIONICS SYSTEM FAULT ECAM A320
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)
2. Job Set-up Information
A. Referenced Information
Ref. AMM 21-26-00-710-001 Operational Check of the Avionics Equipment Ventilation-System via MCDU
Ref. AMM 21-26-00-710-008 Operational Test to Read the CFDS for CLASS 3 Faults of the AEVC
Ref. AMM 21-26-00-710-009 Operational Test to Read the CFDS for LAST LEG REPORT of the AEVC
Ref. ASM 21-26-02
Ref. AMM 21-26-34-000-001 Removal of the Avionics Equipment Ventilation Computer (AEVC)
Ref. AMM 21-26-34-400-001 Installation of the Avionics Equipment Ventilation Computer (AEVC)
Ref. AMM 31-55-34-000-001 Removal of the SDAC
Ref. AMM 31-55-34-400-001 Installation of the SDAC
3. Fault Confirmation
SUBTASK 21-26-00-865-075-A
A. Table of the circuit breakers used in this procedure:
PANEL 122VU AIR COND/AVNCS/VENT/MONG 3HQ Y17
SUBTASK 21-26-00-710-094-A
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).
(3) Read the LAST LEG REPORT of the AEVC Ref. AMM 21-26-00-710-009.
(4) Read the CLASS 3 faults of the AEVC Ref. AMM 21-26-00-710-008.
4. Fault Isolation
SUBTASK 21-26-00-810-074-A
A. If the test gives the maintenance message GND AEVC:
-Replace the AEVC (10HQ) Ref. AMM 21-26-34-000-001 and Ref. AMM 21-26-34-400-001.
(1) If the fault continues:
-Replace the SDAC-1 (1WV1) and the SDAC-2 (1WV2) Ref. AMM 31-55-34-000-001 and Ref. AMM 31-55-34-400-001.
(2) If the fault continues:
— Do a check and repair the wiring between the AEVC (10HQ) and the SDAC-1 (1WV1) and the wiring between the AEVC (10HQ) and the SDAC-2 (1WV2), pins AB/8A and pins AD/12C Ref. ASM 21-26-02.
SUBTASK 21-26-00-710-095-A
B. Do the operational test given in Para. 3.
