Operational Check of the Avionics Equipment Ventilation-System via MCDU

TASK 21-26-00-710-001-A
Operational Check of the Avionics Equipment Ventilation-System via MCDU

ZONE: 210

1. Reason for the Job
Refer to the MPD TASK: 212600-01
OPERATIONAL CHECK OF SYSTEM VIA MCDU
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 21-26-00-040-002-A	Deactivation of the Skin Air Outlet Valve in the Closed Position with the Internal Flap in the Open Position
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 31-32-00-860-002-A	Procedure to Get Access to the SYSTEM REPORT/TEST/AIR COND Page
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 21-26-00-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
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 21-26-00-941-104-A

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

Subtask 21-26-00-861-050-A

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

NOTE: The energization of the aircraft electrical circuits starts a full test of the ventilation system. The test continues for 2 minutes approximately.

Subtask 21-26-00-860-050-C ** ON A/C NOT FOR ALL

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

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

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

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

(3) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(4) On the ECAM control panel, push the PRESS pushbutton switch.
(5) On the lower ECAM DU:

The PRESS page comes into view and shows the skin air-inlet (INLET) and skin air-outlet (EXTRACT) valves in the open position (if the outside air temperature is more than or equal to 12 deg.C (53.60 deg.F)).

NOTE:

Condition 1 : if the outside air temperature measured by the [28HQ] is less than 9 deg.C (48.20 deg.F), the skin air-inlet and skin air-outlet valves are closed.
Condition 2 : if the outside air temperature measured by the [28HQ] is more than or equal to 12 deg.C (53.60 deg.F), the skin air-inlet and skin air-outlet valves are open.

Subtask 21-26-00-860-050-D ** ON A/C NOT FOR ALL

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

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

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

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

(3) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(4) On the ECAM control panel, push the PRESS pushbutton switch.
(5) On the lower ECAM DU:

The PRESS page comes into view and shows the skin air-inlet (INLET) and skin air-outlet (OUTLET) valves in the open position (if the outside air temperature is more than or equal to 12 deg.C (53.60 deg.F)).

NOTE:

Condition 1 : if the outside air temperature measured by the [28HQ] is less than 9 deg.C (48.20 deg.F), the skin air-inlet and skin air-outlet valves are closed.
Condition 2 : if the outside air temperature measured by the [28HQ] is more than or equal to 12 deg.C (53.60 deg.F), the skin air-inlet and skin air-outlet valves are open.

Subtask 21-26-00-860-050-H ** ON A/C NOT FOR ALL

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

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

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

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

(3) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(4) On the ECAM control panel, push the PRESS pushbutton switch.
(5) On the lower ECAM DU:

The PRESS page comes into view and shows the skin air-inlet (INLET) and skin air-outlet (OUTLET) valves in the open position (if the outside air temperature is more than or equal to 12 deg.C (53.60 deg.F)).

NOTE:

Condition 1 : if the outside air temperature measured by the [28HQ] is less than 9 deg.C (48.20 deg.F) and if the inside air temperature measured by the [34HQ] is less than 40 deg.C (104.00 deg.F), the skin air-inlet and skin air-outlet valves are closed.
Condition 2 : if the outside air temperature measured by the [28HQ] is more than or equal to 12 deg.C (53.60 deg.F) and if the inside air temperature measured by the [34HQ] is less than 40 deg.C (104.00 deg.F), the skin air-inlet and skin air-outlet valves are closed.
Condition 3 : if the outside air temperature measured by the [28HQ] is less than 9 deg.C (48.20 deg.F) and if the inside air temperature measured by the [34HQ] is more than 40 deg.C (104.00 deg.F), the skin air-inlet and skin air-outlet valves are open.

Condition 4: if the outside air temperature measured by the [28HQ] is more than or equal to 12 deg.C (53.60 deg.F) and if the inside air temperature measured by the [34HQ] is more than 40 deg.C (104.00 deg.F), the skin air-inlet and skin air-outlet valves are open.

4. Procedure
Subtask 21-26-00-710-050-D ** ON A/C NOT FOR ALL

A. Operational Test of the Avionics Equipment Ventilation-System with the MCDU

NOTE: If you used the MMEL 21-26-04A, refer to the results related to the deactivation of the skin air-outlet valve (22HQ) and the skin exchanger isolation-valve (24HQ) (Ref. AMM TASK 21-26-00-040-002).

NOTE: If you do this procedure after you apply a MMEL task, make sure that the ECAM alert "VENT AVNCS SYS FAULT" is cleared.

ACTION	RESULT
1.On circuit breaker panels 49VU and 122VU: Open circuit breakers 3HQ, 5HQ and 6HQ.	After approximately 30 seconds: You can hear the mechanical call horn in the nose landing-gear well. If the mechanical call horn does not operate, refer to the related external ground-horn item in the MMEL. NOTE: The mechanical call horn operates only if engine 1 and engine 2 are stopped.
2.On panel 108VU, push the RESET pushbutton switch.	The mechanical call horn stops.
3.On circuit breaker panels 49VU and 122VU: Close circuit breakers 3HQ, 5HQ and 6HQ.	NOTE: The energization of the aircraft electrical circuits starts a full self-test of the ventilation system. The test continues for approximately two minutes.
4.On one MCDU, get the SYSTEM REPORT/TEST AIR COND menu page (Ref. AMM TASK 31-32-00-860-002).
5.On one MCDU, on the AIR COND menu page, push the line key adjacent to the AEVC indication.	The AEVC page comes into view.
6.Push the line key adjacent to the TEST indication.	On the AEVC/TEST page: The TEST WAIT indication comes into view for 85 seconds. The blower and extract fans stop. On the VENTILATION section of panel 22VU: The FAULT legends of the BLOWER and EXTRACT pushbutton switches come on. On the ELEC section of panel 21VU: The SMOKE legend of the GEN 1 LINE pushbutton switch comes on. After approximately ten seconds: The blower and extract fans start. On the VENTILATION section of panel 22VU: The FAULT legends of the BLOWER and EXTRACT pushbutton switches go off. On the ELEC section of panel 21VU: The SMOKE legend of the GEN 1 LINE pushbutton switch goes off. On the PRESS page of the lower ECAM DU: The skin air-inlet and skin air-outlet valves are shown as open. NOTE: - The conditioned-air inlet valve opens during the sequence. - The skin-exchanger inlet bypass-valve, the skin-exchanger outlet bypass-valve and the skin-exchanger isolation valve close.
7.Approximately 20 seconds after the start of the test, do a check of the positions of the skin air-inlet and skin air-outlet valves.	On the PRESS page of the lower ECAM DU: The skin air-inlet and skin air-outlet valves are shown as closed. NOTE: - The skin-exchanger inlet bypass-valve and the skin-exchanger isolation valve open. - The skin-exchanger outlet bypass-valve and the conditioned-air inlet valve close.
8.Approximately 40 seconds after the start of the test, do a check of the positions of the skin air-inlet and skin air-outlet valves.	On the PRESS page of the lower ECAM DU: The skin air-inlet valve is shown as closed. The main flap of the skin air-outlet valve is fully closed with the internal flap in fully open position. NOTE: - The skin-exchanger inlet bypass-valve, the skin-exchanger outlet bypass-valve and the skin-exchanger isolation valve open. - The conditioned-air inlet valve is closed.
9.More than one minute after the start of the test, do a check of the positions of the skin air-inlet and skin air-outlet valves.	On the PRESS page of the lower ECAM DU: The positions of the skin-air inlet and skin air-outlet valves are the same as before the start of the test: . Closed when the temperature is less than 9 deg.C (48.20 deg.F). . Open when the temperature is more than or equal to 12 deg.C (53.60 deg.F). NOTE: The skin-exchanger inlet bypass-valve, the skin-exchanger outlet bypass-valve, the skin-exchanger isolation valve and the conditioned-air inlet valve are in the position that is related to the outside air temperature. On the AEVC/TEST page: If the AEVC/TEST senses no failure, the TEST OK indication comes into view. If the AEVC senses a failure, the message(s) related to the failure and the END OF TEST indication come into view.
10.On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.

Subtask 21-26-00-710-050-G ** ON A/C NOT FOR ALL

A. Operational Test of the Avionics Equipment Ventilation-System with the MCDU

NOTE: If you do this procedure after you apply a MMEL task, make sure that the ECAM alert "VENT AVNCS SYS FAULT" is cleared.

ACTION	RESULT
1.On circuit breaker panels 49VU and 122VU: Open circuit breakers 3HQ, 5HQ and 6HQ.	After approximately 30 seconds: You can hear the mechanical call horn in the nose landing-gear well. If the mechanical call horn does not operate, refer to the related external ground-horn item in the MMEL. NOTE: The mechanical call horn operates only if engine 1 and engine 2 are stopped.
2.On panel 108VU, push the RESET pushbutton switch.	The mechanical call horn stops.
3.On circuit breaker panels 49VU and 122VU: Close circuit breakers 3HQ, 5HQ and 6HQ.	NOTE: The energization of the aircraft electrical circuits starts a full self-test of the ventilation system. The test continues for approximately two minutes.
4.On one MCDU, get the SYSTEM REPORT/TEST AIR COND menu page (Ref. AMM TASK 31-32-00-860-002).
5.On one MCDU, on the AIR COND menu page, push the line key adjacent to the AEVC indication.	The AEVC page comes into view.
6.Push the line key adjacent to the TEST indication.	On the AEVC/TEST page: The TEST WAIT indication comes into view for 85 seconds. The blower and extract fans stop. On the VENTILATION section of panel 22VU: The FAULT legends of the BLOWER and EXTRACT pushbutton switches come on. On the ELEC section of panel 21VU: The SMOKE legend of the GEN 1 LINE pushbutton switch comes on. After approximately ten seconds: The blower and extract fans start. On the VENTILATION section of panel 22VU: The FAULT legends of the BLOWER and EXTRACT pushbutton switches go off. On the ELEC section of panel 21VU: The SMOKE legend of the GEN 1 LINE pushbutton switch goes off. On the PRESS page of the lower ECAM DU: The skin air-inlet and skin air-outlet valves are shown as open. NOTE: - The conditioned-air inlet valve opens during the sequence. - The skin-exchanger inlet bypass-valve, the skin-exchanger outlet bypass-valve and the skin-exchanger isolation valve close.
7.Approximately 20 seconds after the start of the test, do a check of the positions of the skin air-inlet and skin air-outlet valves.	On the PRESS page of the lower ECAM DU: The skin air-inlet and skin air-outlet valves are shown as closed. NOTE: - The skin-exchanger inlet bypass-valve and the skin-exchanger isolation valve open. - The skin-exchanger outlet bypass-valve and the conditioned-air inlet valve close.
8.Approximately 40 seconds after the start of the test, do a check of the positions of the skin air-inlet and skin air-outlet valves.	On the PRESS page of the lower ECAM DU: The skin air-inlet valve is shown as closed. The main flap of the skin air-outlet valve is fully closed with the internal flap in fully open position. NOTE: - The skin-exchanger inlet bypass-valve, the skin-exchanger outlet bypass-valve and the skin-exchanger isolation valve open. - The conditioned-air inlet valve is closed.
9.More than one minute after the start of the test, do a check of the positions of the skin air-inlet and skin air-outlet valves.	On the PRESS page of the lower ECAM DU: The positions of the skin-air inlet and skin air-outlet valves are the same as before the start of the test: - Condition 1 : if the outside air temperature measured by the [28HQ] is less than 9 deg.C (48.20 deg.F) and if the inside air temperature measured by the [34HQ] is less than 40 deg.C (104.00 deg.F), the skin air-inlet and skin air-outlet valves are closed. - Condition 2 : if the outside air temperature measured by the [28HQ] is more than or equal to 12 deg.C (53.60 deg.F) and if the inside air temperature measured by the [34HQ] is less than 40 deg.C (104.00 deg.F), the skin air-inlet and skin air-outlet valves are closed. - Condition 3 : if the outside air temperature measured by the [28HQ] is less than 9 deg.C (48.20 deg.F) and if the inside air temperature [34HQ] is more than 40 deg.C (104.00 deg.F), the skin air-inlet and skin air-outlet valves are open. - Condition 4: if the outside air temperature measured by the [28HQ] is more than or equal to 12 deg.C (53.60 deg.F) and if the inside air temperature measured by the [34HQ] is more than 40 deg.C (104.00 deg.F), the skin air-inlet and skin air-outlet valves are open. NOTE: The skin-exchanger inlet bypass-valve, the skin-exchanger outlet bypass-valve, the skin-exchanger isolation valve and the conditioned-air inlet valve are in the position that is related to the outside air temperature. On the AEVC/TEST page: If the AEVC/TEST senses no failure, the TEST OK indication comes into view. If the AEVC senses a failure, the message(s) related to the failure and the END OF TEST indication come into view.
10.On the MCDU, push the line select key adjacent to the RETURN indication until the CFDS menu page comes into view.

5. Close-up
Subtask 21-26-00-860-051-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 21-26-00-862-050-A

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

[Rev.10 from 2021] 2026.03.31 23:02:20 UTC