Reactivation of the Extract Fan

TASK 21-26-00-440-007-A
Reactivation of the Extract Fan

1. Reason for the Job
MMEL 21-26-02B
AVIONICS EXTRACT FAN
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)

3. Job Set-up
Subtask 21-26-00-869-109-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

4. Procedure
Subtask 21-26-00-440-056-A

A. Conditioned Air 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:

Push the EXTRACT pushbutton switch (the OVRD legend goes off).

5. Close-up
Subtask 21-26-00-941-095-A

A. Aircraft Maintenance Configuration
(1) Remove the WARNING NOTICE(S).

Subtask 21-26-00-862-074-A

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

[Rev.10 from 2021] 2026.04.02 06:47:55 UTC