Operational Check of the Avionics Equipment Ventilation (without the CFDS)

TASK 21-26-00-710-001-A-01
Operational Check of the Avionics Equipment Ventilation (without the CFDS)

ZONE: 210

1. Reason for the Job
Refer to the MPD TASK: 212600-01
OPERATIONAL CHECK OF SYSTEM VIA MCDU
Test after the removal/installation of equipment if the CFDS is unserviceable.
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure

3. Job Set-up
Subtask 21-26-00-865-072-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR COND/AVNCS VENT/CTL	6HQ	D06
49VU	AIR COND/AVNCS VENT/CTL	5HQ	D05
122VU	AIR COND/AVNCS/VENT/MONG	3HQ	Y17
** ON A/C NOT FOR ALL
123VU	AVNCS VENT/EXTC/FAN	2HQ	AE02
** ON A/C ALL
123VU	AVNCS VENT/BLOWER/FAN	1HQ	AD10
** ON A/C NOT FOR ALL
123VU	AVNCS VENT/EXTC/FAN	2HQ	AC04

Subtask 21-26-00-941-086-A

B. Safety Precautions
(1) Make sure that the throttle control levers of the engines 1 and 2 are at idle.

Subtask 21-26-00-861-054-A

C. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 21-26-00-860-052-A

D. Aircraft Maintenance Configuration
(1) On the VENTILATION section of the panel 22VU:

make sure that the BLOWER and EXTRACT pushbutton switches are in the AUTO configuration (pushed and with the FAULT and OVRD legends off).

(2) On the CABIN PRESS section of the overhead panel 25VU:

Make sure that the DITCHING pushbutton switch is released (ON legend off).

(3) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).

4. Procedure
Subtask 21-26-00-710-060-A

A. Operational Test of the Avionics Equipment Ventilation (without the CFDS)

NOTE: The procedure is the same for:

the skin air-inlet valve 15HQ,
the skin air-outlet valve 22HQ,
the conditioned-air inlet valve 21HQ,
the skin-exchanger inlet bypass-valve 16HQ,
the skin-exchanger isolation valve 24HQ,
the AEVC 10HQ.

ACTION	RESULT
NOTE: During this test, ignore all the warnings that are not related to the test.
1.On the panel 122VU: open the circuit breaker 3HQ.	On the VENTILATION section of the panel 22VU: the FAULT legends of the BLOWER and EXTRACT pushbutton switches come on. On the upper ECAM display unit: the VENT AVNCS SYS FAULT message comes into view after approximately 15 seconds.
2.On the panel 122VU: close the circuit breaker 3HQ after approximately 20 seconds. NOTE: If you do not close the circuit breaker 3HQ after approximately 20 seconds and if engines 1 and 2 are stopped: you will hear the mechanic call horn in the nose landing gear well. Then on the panel 108VU, push the RESET pushbutton switch to stop the mechanic call horn.	the VENT AVNCS SYS FAULT message goes out of view.
	After 60 seconds (the time necessary for the test), on the upper ECAM DU:
	make sure that the VENT AVNCS SYS FAULT message is not in view.

5. Close-up
Subtask 21-26-00-860-053-A

A. Put the aircraft back to its initial configuration.
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).

Subtask 21-26-00-862-054-A

B. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:02:21 UTC