Failure of one or more valves or of the AEVC

TASK 21-26-00-810-829-A
Failure of one or more valves or of the AEVC

1. Possible Causes

AEVC [10HQ]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 21-26-00-810-801-A	Loss of the Automatic Control and Monitoring of the Valves and Fans
TSM TASK 21-26-00-810-803-A	Failure of the Skin Air-Inlet Valve
TSM TASK 21-26-00-810-804-A	Failure of the Skin Air-Outlet Valve
TSM TASK 21-26-00-810-805-A	Failure of the Conditioned Air-Inlet Valve
TSM TASK 21-26-00-810-806-A	Failure of the Skin Exchanger-Inlet Bypass-Valve
TSM TASK 21-26-00-810-807-A	Failure of the Skin Exchanger Isolation-Valve
TSM TASK 21-26-00-810-813-A	Blower Fan Inoperative because of a Failure of the AEVC
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
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)

3. Fault Confirmation
Subtask 21-26-00-865-060-A

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	AIR COND/AVNCS/VENT/MONG	3HQ	Y17

Subtask 21-26-00-710-098-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).
(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
Subtask 21-26-00-810-082-A

A. Possible maintenance messages:
AEVC
SKIN AIR INLET V 15HQ
INLET BYPASS V 16HQ
COND AIR INLET V 21HQ
SKIN AIR OUTLET V 22HQ
ISOL V 24HQ
associated with the ECAM warning VENT AVNCS SYS FAULT (on ground) or VENT SKIN VALVE FAULT (in flight).

NOTE: The ECAM warnings VENT BLOWER FAULT and VENT EXTRACT FAULT may be inhibited before or after engine running. But a possible actuation of the mechanic call horn can occur.

(1) If the fault continues or if the test gives the maintenance message SKIN AIR INLET V 15HQ:

Do the procedure (Ref. TSM TASK 21-26-00-810-803).

(2) If the fault continues or if the test gives the maintenance message INLET BYPASS V 16HQ:

Do the procedure (Ref. TSM TASK 21-26-00-810-806).

(3) If the fault continues or if the test gives the maintenance message COND AIR INLET V 21HQ:

Do the procedure (Ref. TSM TASK 21-26-00-810-805).

(4) If the test gives the maintenance message SKIN AIR OUTLET V 22HQ:

Do the procedure (Ref. TSM TASK 21-26-00-810-804).

(5) If the fault continues or if the test gives the maintenance message ISOL V 24HQ:

Do the procedure (Ref. TSM TASK 21-26-00-810-807).

(6) If the fault continues or if the test gives the maintenance message AEVC:

Do the procedures (Ref. TSM TASK 21-26-00-810-813) and (Ref. TSM TASK 21-26-00-810-801).

(7) If the fault continues:

Replace the AEVC [10HQ] AMM 21-26-34-000-001 and AMM 21-26-34-400-001.

Subtask 21-26-00-710-099-A

B. Do the operational test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:24:38 UTC