Extract Fan Inoperative - Do the Reactivation of the Conditioned-Air Inlet Valve

TASK 21-26-00-440-015-A
Extract Fan Inoperative - Do the Reactivation of the Conditioned-Air Inlet Valve

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

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
824

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
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
TSM 21	(for corrective action)
Air-Conditioned Inlet Valve

3. Job Set-up
Subtask 21-26-00-861-094-A

A. Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 21-26-00-865-113-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR COND/AVNCS VENT/CTL	5HQ	D05

Subtask 21-26-00-010-098-A

C. Get Access
(1) Put the ACCESS PLATFORM 3M (10 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 21-26-00-440-066-A

A. Reactivation of the Conditioned-Air Inlet Valve (21HQ)
(1) On the conditioned-air inlet valve 21HQ:
(a) Remove the CAP-BLANKING from each electrical connector and receptacle.
(b) Make sure that all the electrical connections are clean and in the correct condition.
(c) Connect the electrical connector 21HQ-A to the valve 21HQ.
(d) Fully close the valve 21HQ with the manual mechanism (the position indicator of the valve moves to C).
(2) On the VENTILATION section of the overhead panel 22VU:

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

Subtask 21-26-00-865-114-A

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR COND/AVNCS VENT/CTL	5HQ	D05

Subtask 21-26-00-810-063-A

C. Do the trouble-shooting of the system TSM 21 and do the necessary repair procedure.

5. Close-up
Subtask 21-26-00-410-095-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).
(4) Remove the WARNING NOTICE(S).
(5) Remove the log book entry.

Subtask 21-26-00-862-097-A

B. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

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