Reactivation of the Skin-Exchanger Isolation Valve

TASK 21-26-00-440-008-A
Reactivation of the Skin-Exchanger Isolation Valve

1. Reason for the Job
MMEL 21-26-06B
AVIONICS SKIN EXCHANGER ISOLATION VALVE
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
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 Exchanger Isolation Valve

3. Job Set-up
Subtask 21-26-00-861-066-A

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

Subtask 21-26-00-865-085-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 21-26-00-010-070-A

C. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the access door 822.
(2) Open access door 822 (Ref. AMM TASK 52-41-00-010-002).

4. Procedure
Subtask 21-26-00-440-060-A

A. Reactivation of the Skin Exchanger Isolation Valve
(1) Remove the tape and get the electric cable and its connector.
(2) Remove the blanking caps from the disconnected electrical connectors.
(3) Make sure that all the electrical connections are clean and in the correct condition.
(4) Connect the electrical connector to valve 24HQ.

Subtask 21-26-00-865-118-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 21-26-00-710-061-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 21-26-00-410-071-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 21-26-00-862-066-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