Deactivation of the Skin Air Outlet Valve in the Closed Position with the Internal Flap in the Open Position

TASK 21-26-00-040-002-A
Deactivation of the Skin Air Outlet Valve in the Closed Position with the Internal Flap in the Open Position

Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
YES	YES	NO	0.3	0.3	1

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	CAP - BLANKING
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 24-41-00-861-002-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
Skin-Air Outlet Valve
Skin Exchanger Isolation Valve
ECAM Display after Deactivation of the Skin Air Outlet Valve

3. Job Set-up
Subtask 21-26-00-861-059-A

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

NOTE: The energization of the aircraft electrical circuits starts a full self-test of the ventilation system. The test continues for approximately two minutes.

(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).

Subtask 21-26-00-865-076-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 21-26-00-869-117-A

C. If the ground horn is in operation:

On the external-power panel 108VU:
Push the RESET pushbutton switch to stop the mechanical call horn.

Subtask 21-26-00-010-075-A

D. 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 the access door 822.

4. Procedure
Subtask 21-26-00-040-052-B

WARNING: OPEN ONLY THE INTERNAL FLAP. THE MAIN FLAP MUST STAY FULLY CLOSED. IF THE MAIN FLAP IS NOT FULLY CLOSED, THE AIRCRAFT WILL NOT PRESSURIZE.

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. Partial Opening Procedure 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.

NOTE: There are two types of skin-air outlet valve 22HQ. To know which type of valve is installed and the correct deactivation procedure to use, refer to the detail C in figure

Skin-Air Outlet Valve

If you deactivate 22HQ (type B), refer to the paragraph A.(1).
If you deactivate 22HQ (type A), refer to the paragraph A.(2).

(1) If skin-air outlet valve 22HQ (type B) is installed:
(a) When the valve is fully closed (main and internal flaps closed):

Skin-Air Outlet Valve

1 Push the PUSH handle latch to release the handle.
2 Before you turn the handle, push it in the direction of the valve to disengage the clutch mechanism.
3 Turn the handle to get access to the deactivation switch.
4 Set the deactivation switch to OFF.
5 Pull the handle to engage the clutch mechanism.
6 Turn the handle clockwise to open the internal flap.

NOTE: Turn the handle clockwise continuously until the desired position is obtained.

7 When the internal flap stops to move and the main flap starts to move:

Turn the handle counterclockwise to a quarter turn or half turn.

8 Stow and latch the handle.

NOTE: When the internal flap is open, if you continue to turn the handle clockwise, the main flap opens.

9 After 40 seconds, on the lower ECAM DU, do a check of the CAB PRESS page:

ECAM Display after Deactivation of the Skin Air Outlet Valve

Make sure that the position indication shows the skin-air outlet valve in amber or green and open to 45 degrees (not fully open).

NOTE: If the position indication of the skin-air outlet valve goes out of view and an amber XX comes into view, the valve is not in the correct position (open to 45 degrees).

(b) When the valve is fully open (main and internal flaps open):

Skin-Air Outlet Valve

1 Push the PUSH handle latch to release the handle.
2 Pull the handle to engage the clutch mechanism.
3 Set the deactivation switch to OFF.
4 Turn the handle counterclockwise until the main flap closes.

NOTE: Turn the handle counterclockwise continuously until the desired position is obtained.

5 When the main flap stops to move and the internal flap starts to move:

Turn the handle clockwise to a quarter turn or half turn.

6 Stow and latch the handle.
7 After 40 seconds, on the lower ECAM DU, do a check of the CAB PRESS page:

ECAM Display after Deactivation of the Skin Air Outlet Valve

Make sure that the position indication shows the skin-air outlet valve in amber or green and open to 45 degrees (not fully open).

NOTE: If the position indication of the skin-air outlet valve goes out of view and an amber XX comes into view, the valve is not in the correct position (open to 45 degrees).

NOTE: When the main flap is closed, if you continue to turn the handle counterclockwise, the internal flap closes.

(2) If the skin-air outlet valve 22HQ (type A) is installed:
(a) When the valve is fully closed (main and internal flaps closed):

Skin-Air Outlet Valve

1 Push the PUSH handle latch to release the handle.
2 Pull the handle to engage the mechanism.
3 Fold out the handle.
4 Set the deactivation switch to OFF.
5 Turn the handle clockwise to open the internal flap.

NOTE: Turn the handle clockwise continuously until the desired position is obtained.

6 When the internal flap stops to move and the main flaps starts to move:

Turn the handle counterclockwise to a quarter turn or half turn.

7 Fold, stow and latch the handle.

NOTE: The internal flap opens when the main flap closes.

8 After 40 seconds, on the lower ECAM DU, do a check of the CAB PRESS page:

ECAM Display after Deactivation of the Skin Air Outlet Valve

Make sure that the position indication shows the skin-air outlet valve in amber or green and open to 45 degrees (not fully open).

NOTE: If the position indication of the skin-air outlet valve goes out of view and an amber XX comes into view, the valve is not in the correct position (open to 45 degrees).

(b) When the valve is fully open (main and internal flaps open):

Skin-Air Outlet Valve

1 Push the PUSH handle latch to release the handle.
2 Pull the handle to engage the mechanism.
3 Fold out the handle.
4 Set the deactivation switch to OFF.
5 Turn the handle counterclockwise until the main flap closes.

NOTE: Turn the handle counterclockwise continuously until the desired position is obtained.

6 When the main flap stops to move and the internal flap starts to move:

Turn the handle clockwise to a quarter turn or half turn.

7 Fold, stow and latch the handle.
8 After 40 seconds, on the lower ECAM DU, do a check of the CAB PRESS page:

ECAM Display after Deactivation of the Skin Air Outlet Valve

Make sure that the position indication shows the skin-air outlet valve in amber or green and open to 45 degrees (not fully open).

NOTE: If the position indication of the skin-air outlet valve goes out of view and an amber XX comes into view, the valve is not in the correct position (open to 45 degrees).

NOTE: When the main flap is closed, if you continue to turn the handle counterclockwise, the internal flap closes.

(3) On the skin exchanger isolation-valve 24HQ:

Skin Exchanger Isolation Valve

(a) Disconnect the electrical connector 24HQ-A from the valve 24HQ.
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Attach the electrical cable with its connector near the valve.
(d) Open valve 24HQ (manual control handle in position 0) manually.
(4) In the bottom part of the upper ECAM DU:
(a) The VENT AVNCS SYS FAULT warning comes into view.

Ignore this warning.

(b) On the ECAM control panel:

Push the CLR key.

Subtask 21-26-00-865-093-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 21-26-00-710-087-A

C. Operational Test of the Avionics Equipment Ventilation from the MCDU

CAUTION: AFTER THE DEACTIVATION OF THE APPLICABLE VALVE, MAKE SURE THAT YOU DO THE OPERATIONAL TEST OF THE AVIONICS-EQUIPMENT VENTILATION-SYSTEM BEFORE EACH FLIGHT.

(1) Do an operational test of the avionics equipment ventilation from the MCDU (Ref. AMM TASK 21-26-00-710-001).
(a) If the valve is not in the correct position (open to 45 degrees):

After forty seconds, on the lower ECAM DU, on the CAB PRESS page:
. The position indication of the skin-air outlet valve goes out of view and an amber XX comes into view.
ECAM Display after Deactivation of the Skin Air Outlet Valve

(b) If there is an extract-fan fault indication:

On the VENTILATION section of the overhead panel 22VU:
. The FAULT legend of the EXTRACT pushbutton switch comes on amber, and
On the CAB PRESS page:
. The EXTRACT indication is amber.

(c) Release the EXTRACT pushbutton switch (the OVRD legend comes on).
(d) Push the EXTRACT pushbutton switch (AUTO position).
(2) Make sure that the extract fan indication is correct.
(3) Make sure that all the fault messages shown are related to:

The fault of the skin air outlet-valve, and
The deactivation of the skin exchanger isolation-valve.

(a) If other messages are shown, refer to the related MMEL item.
(4) No other procedure is necessary, if:
On the lower ECAM DU, on the CAB PRESS page:

The skin air-inlet-valve symbol is shown amber (because the outside air temperature is near the AEVC (Avionics Equipment Ventilation Computer) temperature limit), and
The operational test of the AEVC gives no maintenance message related to the skin air-inlet valve.

5. Close-up
Subtask 21-26-00-410-075-A

A. Close Access
(1) Close the access door 822.
(2) Remove the access platform(s).

Subtask 21-26-00-942-076-A

B. Safety Precautions
(1) Make an entry in the logbook.

Subtask 21-26-00-862-059-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 06:47:56 UTC