Operational Test of the Extract and Blower Fans (without the CFDS)

TASK 21-26-51-710-001-A
Operational Test of the Extract and Blower Fans (without the CFDS)

FIN: 18HQ
FIN: 20HQ

1. Reason for the Job
To do the test after the removal/installation of the blower fan or the extract fan if the CFDS is unserviceable.
2. Job Set-up Information
A. 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 21-26-51-865-053-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 21-26-51-869-052-A

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

Subtask 21-26-51-861-052-A

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

Subtask 21-26-51-860-051-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 with the FAULT and OVRD legends off).

(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).

4. Procedure
Subtask 21-26-51-710-050-A

A. Operational Test of the Extract and Blower Fans

ACTION	RESULT
1.On the circuit breaker 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 DU: the AVNCS SYS FAULT indication comes into view after approximately 10 seconds.
2.On the circuit breaker panel 122VU: close the circuit breaker 3HQ.	On the VENTILATION section of the panel 22VU: the FAULT legends of the BLOWER and EXTRACT pushbutton switches go off after 10 seconds. On the upper ECAM DU: the AVNCS SYS FAULT indication goes out of view.

5. Close-up
Subtask 21-26-51-860-052-A

A. Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).

Subtask 21-26-51-862-052-A

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

[Rev.10 from 2021] 2026.04.02 06:47:58 UTC