Operational Check of Override Function (BLOWER and EXTRACT)

TASK 21-26-00-710-002-A
Operational Check of Override Function (BLOWER and EXTRACT)

ZONE: 210

1. Reason for the Job
Refer to the MPD TASK: 212600-02
OPERATIONAL CHECK OF OVERRIDE FUNCTION (BLOWER AND EXTRACT)
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 21-26-12-000-802-A	Removal of the Avionics-Ventilation Comfort Duct-Temperature-Sensor
TASK 21-26-12-400-802-A	Installation of the Avionics-Ventilation Comfort Duct-Temperature-Sensor
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 21-26-00-040-074-A ** ON A/C NOT FOR ALL

A. Deactivation of the Avionics-Ventilation Comfort Duct-Temperature-Sensor
(1) Disconnect the electrical connector from the duct temperature sensor (Ref. AMM TASK 21-26-12-000-802).

Subtask 21-26-00-865-051-A

B. 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 21-26-00-941-087-A

C. Safety Precautions
(1) Make sure that the engine 1 and 2 throttle control levers are at idle.

Subtask 21-26-00-861-051-A

D. 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 21-26-00-860-054-C ** ON A/C NOT FOR ALL

E. 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 (the pusbutton switches are pushed and the FAULT and the OVRD legends are off).

(2) Do the Electronic Instrument System (EIS) start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On the ECAM control panel, push the PRESS pushbutton key.
(4) On the lower ECAM display unit:

The CAB PRESS page comes into view and shows the skin air-inlet (INLET) and the skin air-outlet (EXTRACT) valves in the open position (if the outside air temperature is more than or equal to 12 DEG.C (53.6 DEG.F)).

NOTE: If the outside air temperature is less than 9 DEG.C (48.2 DEG.F), the skin air-inlet and the skin air-outlet valves are closed.

NOTE: If the avionics duct temperature is less than 40 DEG.C (104 DEG.F), the skin air-inlet and the skin air-outlet valves are closed.

Subtask 21-26-00-860-054-D ** ON A/C NOT FOR ALL

E. 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 (the pusbutton switches are pushed and the FAULT and the OVRD legends are off).

(2) Do the Electronic Instrument System (EIS) start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On the ECAM control panel, push the PRESS pushbutton key.
(4) On the lower ECAM display unit:

The CAB PRESS page comes into view and shows the skin air-inlet (INLET) and the skin air-outlet (OUTLET) valves in the open position (if the outside air temperature is more than or equal to 12 DEG.C (53.6 DEG.F)).

NOTE: If the outside air temperature is less than 9 DEG.C (48.2 DEG.F), the skin air-inlet and the skin air-outlet valves are closed.

NOTE: If the avionics duct temperature is less than 40 DEG.C (104 DEG.F), the skin air-inlet and the skin air-outlet valves are closed.

4. Procedure
Subtask 21-26-00-710-051-A ** ON A/C NOT FOR ALL

A. Operational Test of the Override Function

ACTION	RESULT
1.On the VENTILATION section of panel 22VU: Release the BLOWER pushbutton switch.	On the VENTILATION section of panel 22VU: On the BLOWER pushbutton switch, the OVRD legend comes on. The blower fan stops. On the PRESS page of the lower ECAM DU: The skin air-inlet valve (INLET) and the skin air-outlet valve (EXTRACT) close. NOTE: If the outside air temperature is less than 9 DEG.C (48.2 DEG.F), the skin air-inlet and skin air-outlet valves stay closed. NOTE: The skin-exchanger isolation valve and the conditioned-air inlet valve open.
2.On the VENTILATION section of panel 22VU: Push the BLOWER pushbutton switch.	On the VENTILATION section of panel 22VU: On the BLOWER pushbutton switch, the OVRD legend goes off. The blower fan starts. On the PRESS page of lower ECAM DU: The skin air-inlet valve (INLET) and the skin air-outlet valve (EXTRACT) open. NOTE: If the outside air temperature is less than 9 DEG.C (48.2 DEG.F), the skin air-inlet and skin air-outlet valves stay closed. NOTE: The skin-exchanger isolation valve and the conditioned-air inlet valve close.
3.On the VENTILATION section of panel 22VU: Release the EXTRACT pushbutton switch.	On the VENTILATION section of panel 22VU: On the EXTRACT pushbutton switch, the OVRD legend comes on. NOTE: The extract fan continues to operate when the OVRD legend is on. The skin-exchanger isolation valve and the conditioned-air inlet valve open. On the PRESS page of the lower ECAM DU: The skin air-inlet valve (INLET) and the skin air-outlet valve (EXTRACT) close. NOTE: If the outside air temperature is less than 9 DEG.C (48.2 DEG.F), the skin air-inlet and skin air-outlet valves stay closed.
4.On the VENTILATION section of panel 22VU: Push the EXTRACT pushbutton switch.	On the VENTILATION section of panel 22VU: On the EXTRACT pushbutton switch, the OVRD legend goes off. On the PRESS page of the lower ECAM DU: The skin air-inlet valve (INLET) and the skin air-outlet valve (EXTRACT) open. NOTE: If the outside air temperature is less than 9 DEG.C (48.2 DEG.F), the skin air-inlet and skin air-outlet valves stay closed. NOTE: The skin exchanger isolation valve and the conditioned-air inlet valve close.

Subtask 21-26-00-710-051-B ** ON A/C NOT FOR ALL

A. Operational Test of the Override Function

ACTION	RESULT
1.On the VENTILATION section of panel 22VU: Release the BLOWER pushbutton switch.	On the VENTILATION section of panel 22VU: On the BLOWER pushbutton switch, the OVRD legend comes on. The blower fan stops. On the PRESS page of the lower ECAM DU: The skin air-inlet valve (INLET) and the skin air-outlet valve (OUTLET) close. NOTE: If the outside air temperature is less than 9 DEG.C (48.2 DEG.F), the skin air-inlet and skin air-outlet valves stay closed. NOTE: The skin-exchanger isolation valve and the conditioned-air inlet valve open.
2.On the VENTILATION section of panel 22VU: Push the BLOWER pushbutton switch.	On the VENTILATION section of panel 22VU: On the BLOWER pushbutton switch, the OVRD legend goes off. The blower fan starts. On the PRESS page of the lower ECAM DU: The skin air-inlet valve (INLET) and the skin air-outlet valve (OUTLET) open. NOTE: If the outside air temperature is less than 9 DEG.C (48.2 DEG.F), the skin air-inlet and skin air-outlet valves stay closed. NOTE: The skin-exchanger isolation valve and the conditioned-air inlet valve close.
3.On the VENTILATION section of panel 22VU: Release the EXTRACT pushbutton switch.	On the VENTILATION section of panel 22VU: On the EXTRACT pushbutton switch, the OVRD legend comes on. NOTE: The extract fan continues to operate when the OVRD legend is on. The skin-exchanger isolation valve and the conditioned-air inlet valve open. On the PRESS page of the lower ECAM DU: The skin air-inlet valve (INLET) and the skin air-outlet valve (OUTLET) close. NOTE: If the outside air temperature is less than 9 DEG.C (48.2 DEG.F), the skin air-inlet and skin air-outlet valves stay closed.
4.On the VENTILATION section of panel 22VU: Push the EXTRACT pushbutton switch.	On the VENTILATION section of panel 22VU: On the EXTRACT pushbutton switch, the OVRD legend goes off. On the PRESS page of the lower ECAM DU: The skin air-inlet valve (INLET) and the skin air-outlet valve (OUTLET) open. NOTE: If the outside air temperature is less than 9 DEG.C (48.2 DEG.F), the skin air-inlet and skin air-outlet valves stay closed. NOTE: The skin exchanger isolation valve and the conditioned-air inlet valve close.

5. Close-up
Subtask 21-26-00-860-055-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 21-26-00-862-051-A

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

Subtask 21-26-00-440-067-A ** ON A/C NOT FOR ALL

C. Reactivation of the Avionics-Ventilation Comfort Duct-Temperature-Sensor
(1) Connect the electrical connector to the duct temperature sensor (Ref. AMM TASK 21-26-12-400-802).

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