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

 (3)
 Remove the clamps (13) and (11). NOTE : Do not discard the clamps (13) and (11). You must keep and use

____ them during the installation procedure.

 (4)
 Move the flexible sleeve (12) which is on the duct (10) to disengage the valve (15).

 (5)
 Remove the clamp (17) and the valve (15).

 (6)
 Discard the O-ring (16).

 (7)
 Remove the flexible sleeve (12).

 Skin Exchanger Inlet Bypass Valve
 Figure 401/TASK 21-26-55-991-002
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 (8) Put blanking plugs on the disconnected line ends. 
R  **ON A/C 051-052, 
R  Subtask 21-26-55-020-054-A 
R  A. Removal of the Skin Exchanger Inlet Bypass Valve 
R  (1) Disconnect the electrical connector (14) from the valve (15). 
R  (2) Put blanking caps on the disconnected electrical connectors. 
R  (3) Remove the clamps (13) and (11). 
R  (4) Move the flexible sleeve (12) which is on the duct (10) to disengage 
R  the valve (15). 
R  (5) Remove the clamp (17) and the valve (15). 
R  (6) Discard the O-ring (16). 
R  (7) Remove the flexible sleeve (12). 
R  (8) Put blanking plugs on the disconnected line ends.

R **ON A/C ALL
 TASK 21-26-55-400-001
 Installation of the Avionics Ventilation Skin Exchanger Inlet Bypass Valve
 (16HQ)
 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
 -------------------------------------------------------------------------------
16 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 52-41-00-410-002 Close the Avionics Compartment Doors after Access 53-12-13-000-001 Removal of the avionics compartment floor panels 53-12-13-400-001 Installation of the avionics compartment floor panels 21-26-55-991-002 Fig. 401

 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 21-26-55-860-051
 A. Aircraft Maintenance Configuration
 (1) Make sure that the ground service network is energized (Ref. TASK 24-42-00-861-001).
 Subtask 21-26-55-010-058
 B. Get Access
 (1)
 Make sure that the access platform is in position at the access door

 824.

 (2)
 Make sure that the access door 824 is open.

 (3)
 Make sure that the access panel 128EG is removed (Ref. TASK 53-12-13-000-001).

 Subtask 21-26-55-865-061
 C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR COND/AVNCS VENT/CTL 6HQ D06
 Subtask 21-26-55-210-053
 D. Visual Inspection
 (1) Make sure that the clamps, the flexible sleeve and the valve are in good condition; replace if necessary.
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