Extract Fan Inoperative - Check of Conditioned-Air Inlet Valve Open

TASK 21-26-00-040-007-A
Extract Fan Inoperative - Check of Conditioned-Air Inlet Valve Open

Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
YES	YES	NO	0.5	0.5	1

1. Reason for the Job
MMEL 21-26-02B
AVIONICS EXTRACT FAN
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
824

C. 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
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
Air-Conditioned Inlet Valve

3. Job Set-up
Subtask 21-26-00-861-075-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).

Subtask 21-26-00-010-065-A

B. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 824.
(2) Open the access door 824 (Ref. AMM TASK 52-41-00-010-002).

4. Procedure
Subtask 21-26-00-040-056-A

A. Conditioned Air Inlet Valve

Air-Conditioned Inlet Valve

(1) Make sure that the operation of avionics equipment ventilation with electrical ground power, has the time limits that follow:

outside air temperature 38 deg.C or less, no time limit
outside air temperature 45 deg.C, maximum of 3 hours
outside air temperature 55 deg.C, maximum of thirty five minutes.

(2) On the VENTILATION section of the overhead control and indicating panel 22VU:

Release the EXTRACT pushbutton switch (the OVRD legend comes on).

(3) On the bottom part of the upper ECAM display unit:

the VENT EXTRACT FAULT warning comes into view.

Disregard this warning.
On the ECAM control panel:

push the CLR key.

(4) If the VENT BLOWER FAULT warning comes into view:

push the CAB FANS pushbutton switch on the VENTILATION section of the panel 22VU (the OFF legend goes off),
make sure that the VENT BLOWER FAULT warning goes out of view.

(5) In the avionics compartment:

Make sure that the conditioned-air inlet valve 21HQ is open (the position indicator of the valve is at 0).

5. Close-up
Subtask 21-26-00-410-066-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 824 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).

Subtask 21-26-00-942-079-A

B. Safety Precautions
(1) Put a WARNING NOTICE(S) in the cockpit to tell the crew that the Extract Fan is deactivated.
(2) Make an entry in the logbook.

Subtask 21-26-00-862-081-A

C. Aircraft Maintenance Configuration
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.02 06:10:59 UTC