Skin-Exchanger Isolation Valve Inoperative - Check of the Open Position of the Valve

TASK 21-26-00-040-008-A
Skin-Exchanger Isolation Valve Inoperative - Check of the Open Position of the Valve

Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
YES	YES	NO	0.2	0.2	1

1. Reason for the Job
MMEL 21-26-06A
AVIONICS SKIN EXCHANGER ISOLATION VALVE
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	1	WARNING NOTICE(S)

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)
Skin Exchanger Isolation Valve

3. Job Set-up
Subtask 21-26-00-861-065-A

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

Subtask 21-26-00-010-069-A

B. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the access door 822.
(2) Open the access door 822.

4. Procedure
Subtask 21-26-00-040-060-A

A. Check of the Open Position of the Valve
(1) In the avionics compartment:

Make sure that the skin-exchanger isolation valve 24HQ is open (the position indicator of the valve is at 0).

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.

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

NOTE: Make sure that all the fault messages shown are related to the fault of the skin-exchanger isolation valve. If other messages are shown, refer to the related MMEL valve item.

5. Close-up
Subtask 21-26-00-410-070-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 822.
(3) Remove the access platform(s).

Subtask 21-26-00-942-075-A

B. Safety Precautions
(1) Put a WARNING NOTICE(S) in position in the cockpit to tell the crew that the skin-exchanger isolation valve is deactivated.
(2) Make an entry in the logbook.

Subtask 21-26-00-862-065-A

C. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

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