DOC AIRBUS | TSM A320FExtract Fan Inoperative due to a Failure of the AEVC
TASK 21-26-00-810-844-A
Extract Fan Inoperative due to a Failure of the AEVC
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 21-26-00-865-073-A
Subtask 21-26-00-810-094-A
[Rev.8 from Aug 2018]
2026.04.04 04:24:39 UTC
Extract Fan Inoperative due to a Failure of the AEVC
1. Possible Causes
- AEVC [10HQ]
- wiring
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) |
Subtask 21-26-00-865-073-A
A. Table of the circuit breakers used in this procedure:
Subtask 21-26-00-710-115-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 21-26-00-810-094-A
A. If the test gives the maintenance message AEVC:
Subtask 21-26-00-710-127-A - Replace the AEVC [10HQ] AMM 21-26-34-000-001 and AMM 21-26-34-400-001.
- Do a check and repair the wiring ASM 212602 between:
. Pin 2 of the AIR COND/AVNCS/VENT/CTL circuit breaker (6HQ) and pin A/E of the avionics-ventilation extract fan (18HQ)
. Pin A/D of the avionics-ventilation extract fan (18HQ) and pin X of the avionics-ventilation extract-fan contactor (7HQ)
. Pin Z of the avionics-ventilation extract fan contactor (7HQ) and pin AA/9A of the AEVC (10HQ).
B. Do the test given in Para. 3.