_______ 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 21-26-55-861-052
 A. Energize the ground service network
 (Ref. TASK 24-42-00-861-001).

 1EFF : ALL 1 21-26-55Page 410 1 1 May 01/05R 1 1 1CES 1

 Subtask 21-26-55-865-053
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR COND/AVNCS VENT/CTL 6HQ D06
 Subtask 21-26-55-010-052
 C. Get Access
 (1)
 Put the access platform in position at the access door 822.

 (2)
 Open the access door 822.

 4. Procedure
_________ (Ref. Fig. 402/TASK 21-26-55-991-003) R **ON A/C 001-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 Subtask 21-26-55-020-052
 A. Removal of the Skin Exchanger Isolation Valve
 (1)
 Disconnect the electrical connector (24) from the valve (23).

 (2)
 Put blanking caps on the disconnected electrical connectors.

 (3)
 Remove the clamps (25) and (27). NOTE : Do not discard the clamps (25) and (27). You must keep and use

____ them during the installation procedure.

 (4)
 Move the flexible sleeve (26) on the duct (28) to disengage the valve.

 (5)
 Remove the clamp (21) and the valve (23).

 (6)
 Discard the O-ring (22).

 (7)
 Remove the flexible sleeve (26).

 (8)
 Put blanking plugs on the disconnected line ends.

 Skin Exchanger Isolation Valve Figure 402/TASK 21-26-55-991-003
 1EFF : 1 1R 1CES  ALL  1 11 1 21-26-55 Page 412 May 01/05

R  **ON A/C 051-052, 
R  Subtask 21-26-55-020-052-A 
R  A. Removal of the Skin Exchanger Isolation Valve 
R  (1) Disconnect the electrical connector (24) from the valve (23). 
R  (2) Put blanking caps on the disconnected electrical connectors. 
R  (3) Remove the clamps (25) and (27). 
R  (4) Move the flexible sleeve (26) on the duct (28) to disengage the 
R  valve. 
R  (5) Remove the clamp (21) and the valve (23). 
R  (6) Discard the O-ring (22). 
R  (7) Remove the flexible sleeve (26). 
R  (8) Put blanking plugs on the disconnected line ends. 

R 1EFF : 051-052, 1 21-26-55Page 413 1 1 May 01/05 1 1 1CES 1R **ON A/C ALL

 TASK 21-26-55-400-002
 Installation of the Avionics Ventilation Skin Exchanger Isolation Valve (24HQ)

 1.
 Reason for the Job

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific access platform 1.6 m (5 ft. 3 in.)
 B. Expendable Parts
 -------------------------------------------------------------------------------
FIG.ITEM |DESIGNATION |IPC-CSN
 -------------------------------------------------------------------------------
22 O-ring 21-26-01 17 -020
 C. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
R 21-26-00-710-001 Operational Check of System via MCDU R 21-26-00-710-001 Operational Check of System via MCDU 24-42-00-861-001 Energize the Ground Service Network from the External Power 24-42-00-862-001 De-energize the Ground Service Network Supplied from the External Power 21-26-55-991-003 Fig. 402

 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 21-26-55-860-052
 A. Aircraft Maintenance Configuration
　
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