______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps
 No specific blanking plugs
 No specific circuit breaker(s) safety clip(s)
 No specific access platform 1.6 m (5 ft. 3 in.)

 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-42-00-861-001  Energize the Ground Service Network from the External Power 21-26-55-991-004 Fig. 403
 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 21-26-55-861-054
 A. Energize the ground service network
 (Ref. TASK 24-42-00-861-001).

 1EFF : ALL 1 21-26-55Page 419 1 1 May 01/05R 1 1 1CES 1

 Subtask 21-26-55-865-056
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR COND/AVNCS VENT/CTL 6HQ D06 49VU AIR COND/AVNCS VENT/CTL 5HQ D05
 Subtask 21-26-55-010-053
 C. Get Access
 (1)
 Put the access platform in position at the access door 812.

 (2)
 Open the access door 812.

 4. Procedure
_________
 (Ref. Fig. 403/TASK 21-26-55-991-004) Subtask 21-26-55-020-053
 A. Removal of the Skin Exchanger Outlet Bypass Valve
 (1)
 Disconnect the electrical connector (36) from the valve (37).

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

 (3)
 Remove the bolt (31) and the nut (30).

 (4)
 Loosen the two screws (33).

 (5)
 Remove the clamp (39) and the valve (37).

 (6)
 Discard the O-ring (38).

 (7)
 Put blanking plugs on the disconnected line ends.

 (8)
 Remove the clamp (35) and the grid (34).

 1EFF : ALL 1 21-26-55Page 420 1 1 May 01/05R 1 1 1CES 1

 Skin Exchanger Outlet Bypass Valve Figure 403/TASK 21-26-55-991-004
 1EFF : 1 1R 1CES  ALL  1 11 1 21-26-55 Page 421 May 01/05

 TASK 21-26-55-400-003
 Installation of the Avionics Ventilation Skin Exchanger Outlet Bypass Valve (23HQ)
 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
 -------------------------------------------------------------------------------
38 O-ring 21-26-01 21 -100
 C. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
R 21-26-00-710-001 Operational Check of System via MCDU 21-26-55-710-001 Operational Test of the Skin-Exchanger Outlet Bypass-Valve (23HQ) without the Centralized Fault Display System (CFDS) 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 21-26-55-991-004 Fig. 403

 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 21-26-55-860-053
 A. Aircraft Maintenance Configuration
 (1) Make sure that the ground service network is energized (Ref. TASK 24-42-00-861-001).
　
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