Reactivation of the Skin Air Inlet Valve

TASK 21-26-00-440-004-A
Reactivation of the Skin Air Inlet Valve

FIN: 15HQ

1. Reason for the Job
MMEL 21-26-05A
AVIONICS SKIN AIR INLET 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)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
824

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
Air-Conditioned Inlet Valve
Skin Air-Inlet Valve

3. Job Set-up

CAUTION: USE ONLY THE GROUND SERVICE NETWORK TO SUPPLY ELECTRICITY BECAUSE THE AVIONICS VENTILATION SYSTEM IS NOT SERVICEABLE. IF YOU ENERGIZE THE AIRCRAFT ELECTRICAL CIRCUITS WITHOUT THE VENTILATION SYSTEM YOU WILL CAUSE DAMAGE TO ELECTRICAL EQUIPMENT.

Subtask 21-26-00-861-064-A

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

Subtask 21-26-00-865-082-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
49VU	AIR COND/AVNCS VENT/CTL	5HQ	D05

Subtask 21-26-00-010-081-A

C. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT) in position on the left side of the aircraft, below valve 15HQ.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at access door 824.
(3) Open access door 824 (Ref. AMM TASK 52-41-00-010-002).

4. Procedure
Subtask 21-26-00-440-054-B

A. Reactivation of Skin Air-Inlet Valve 15HQ

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.

(1) On conditioned-air inlet valve 21HQ:

Air-Conditioned Inlet Valve

(a) Fully close conditioned-air inlet valve 21HQ with the manual mechanism (the position indicator of the valve goes to C).
(2) On skin air-inlet valve 15HQ:

Skin Air-Inlet Valve

(a) Push the PUSH latch to release the handle.
(b) Before you turn the handle, push it in the direction of the valve to disengage the clutch mechanism.
(c) Turn the handle to get access to the deactivation switch.
(d) Set the deactivation switch to ON.
(e) Pull the handle to engage the clutch mechanism.
(f) Turn the handle counterclockwise to fully close the flap.
(g) Stow and latch the handle.

Subtask 21-26-00-865-083-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
49VU	AIR COND/AVNCS VENT/CTL	5HQ	D05

Subtask 21-26-00-710-092-A

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

5. Close-up
Subtask 21-26-00-410-078-A

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

Subtask 21-26-00-862-064-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