Reactivation of the Skin Air Outlet Valve from the Closed Position

TASK 21-26-00-440-002-A
Reactivation of the Skin Air Outlet Valve from the Closed Position

1. Reason for the Job
MMEL 21-26-04A
AVIONICS SKIN AIR OUTLET VALVE
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	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
822

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-26-00-710-001-A	Operational Check of the Avionics Equipment Ventilation-System via MCDU
TASK 21-26-00-710-001-A-01	Operational Check of the Avionics Equipment Ventilation (without the CFDS)
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
Skin-Air Outlet Valve
Skin Exchanger Isolation Valve

3. Job Set-up
Subtask 21-26-00-861-060-A

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

Subtask 21-26-00-865-080-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	6HQ	D06

Subtask 21-26-00-010-079-A

C. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position on the right side of the aircraft, below the skin-air outlet-valve 22HQ.
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE at the access door 822.
(3) Open access door 822 (Ref. AMM TASK 52-41-00-010-002).

4. Procedure
Subtask 21-26-00-440-052-A

CAUTION: DO NOT USE FORCE TO TURN THE HANDLE. THERE ARE SHEAR PINS IN THE HANDLE. IF YOU APPLY FORCE TO THE HANDLE WHEN THE FLAP IS IN THE FULLY OPEN OR CLOSED POSITION, THE SHEAR PINS WILL BREAK.

A. Reactivation of the Skin-Air Outlet Valve

NOTE: If the aircraft de-icing is necessary, you must be careful not to apply de-icing fluid on the skin air-outlet-valve area. During aircraft de-icing, you can keep the internal flap of the skin air-outlet-valve closed to prevent avionics equipment contamination. Open the flap after de-icing.

(1) On skin-air outlet-valve 22HQ:
(a) Push the PUSH latch to release the handle.
(b) Pull the handle and set the deactivation switch to ON.
(c) Stow and latch the handle.
(2) On skin-exchanger isolation-valve 24HQ:
(a) Get the electrical cable and its connector.
(b) Remove the CAP-BLANKING from each electrical connector and receptacle.
(c) Make sure that all the electrical connections are clean and in the correct condition.
(d) Connect electrical connector 24HQ-A to valve 24HQ.

Subtask 21-26-00-865-119-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	6HQ	D06

Subtask 21-26-00-710-055-A

C. Do an operational test of the ventilation system of the avionics equipment (Ref. AMM TASK 21-26-00-710-001).

5. Close-up
Subtask 21-26-00-410-077-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access door 822 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

Subtask 21-26-00-862-060-A

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

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