Reactivation of the Skin Exchanger Inlet Bypass valve

TASK 21-26-00-440-001-A
Reactivation of the Skin Exchanger Inlet Bypass valve

1. Reason for the Job
MMEL 21-26-03A
AVIONICS SKIN EXCHANGER INLET BYPASS 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	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
128EG, 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
TASK 53-12-13-000-001-A	Removal of the avionics compartment floor panels
TASK 53-12-13-400-001-A	Installation of the avionics compartment floor panels
Skin Exchanger Inlet Bypass Valve

3. Job Set-up
Subtask 21-26-00-861-058-A

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

Subtask 21-26-00-865-062-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 21-26-00-010-055-B

C. Get Access
(1) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position at the access door 824.
(2) Open access door 824 (Ref. AMM TASK 52-41-00-010-002).
(3) Remove access panel 128EG (Ref. AMM TASK 53-12-13-000-001).

4. Procedure
Subtask 21-26-00-440-051-A

A. Reactivation of the Skin Exchanger Inlet-Bypass-Valve

Skin Exchanger Inlet Bypass Valve

(1) Remove the tape and get the electric cable and its connector.
(2) Remove the CAP-BLANKING from each electrical connector and receptacle.
(3) Make sure that all the electrical connections are clean and in the correct condition.
(4) Connect electrical connector 16HQ-A to valve 16HQ.

Subtask 21-26-00-865-122-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 21-26-00-410-055-B

C. Install two screws to hold the access panel 128EG temporarily (Ref. AMM TASK 53-12-13-400-001).

Subtask 21-26-00-710-054-A

D. Do an operational test of the ventilation system of the avionics equipment (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 inlet-bypass-valve. If other messages are shown, refer to the related MMEL valve item.

5. Close-up
Subtask 21-26-00-410-056-B

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install access panel 128EG (Ref. AMM TASK 53-12-13-400-001).
(3) Close access door 824 (Ref. AMM TASK 52-41-00-410-002).
(4) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).

Subtask 21-26-00-862-058-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