Failure of the Skin Air-Outlet Valve

TASK 21-26-00-810-804-A
Failure of the Skin Air-Outlet Valve

1. Possible Causes

VALVE-SKIN AIR OUTLET, AVNCS VENT [22HQ]
wiring between the AEVC (10HQ) and the skin air-outlet valve (22HQ)
AEVC [10HQ]
wiring between the AEVC (10HQ) and the SDAC-1 (1WV1) and/or SDAC-2 (1WV2)

2. Job Set-up Information
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 21-26-42-200-002	Inspection/Check of the Skin Heat Exchanger (Outlet Duct)
AMM 21-26-53-000-002	Removal of the Skin Air Outlet-Valve
AMM 21-26-53-400-001	Installation of the Skin Air Outlet-Valve

3. Fault Confirmation
Subtask 21-26-00-865-058-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 21-26-00-710-080-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 21-26-00-810-101-A

A. If the test gives the maintenance message SKIN AIR OUTLET V 22HQ and the logbook or the Post Flight Report (PFR) gives the ECAM warning VENT BLOWER FAULT:

Replace the VALVE-SKIN AIR OUTLET, AVNCS VENT [22HQ] AMM 21-26-53-000-002 AMM 21-26-53-400-001.
Do a check of the skin heat exchanger (outlet duct) AMM 21-26-42-200-002.

Subtask 21-26-00-810-067-A

B. If the test gives the maintenance message SKIN AIR OUTLET V 22HQ and the logbook or the Post Flight Report (PFR) does not give the ECAM warning VENT BLOWER FAULT:

Do a check of the status of the skin air-outlet valve (22HQ) on the lower ECAM display unit.

(1) If the valve symbol is green:

Do a check and repair the wiring between the AEVC (10HQ) and the skin air-outlet valve (22HQ) ASM 212602:
. Pin AA/3A and pin A/A
. Pin AA/3B and pin A/C
. Pin AA/3C and pin A/E.

(2) If the valve symbol is amber:

Do a check and repair the wiring between the AEVC (10HQ) and the skin air-outlet valve (22HQ) ASM 212602:
. Pin AB/3A and pin A/J
. Pin AB/3B and pin A/M
. Pin AB/3C and pin A/R.

(3) If the fault continues:

Replace the VALVE-SKIN AIR OUTLET, AVNCS VENT [22HQ] AMM 21-26-53-000-002 and AMM 21-26-53-400-001.

(a) If the fault continues:

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

(4) If the fault continues:

Do a check and repair the wiring between the AEVC (10HQ) and the SDAC-1 (1WV1) and/or SDAC-2 (1WV2), pin AB/8A and pin AD/12C ASM 212602.

Subtask 21-26-00-710-081-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:24:36 UTC