4. Procedure
_________ (Ref. Fig. 401/TASK 21-26-55-991-002) R **ON A/C 001-049, 053-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 Subtask 21-26-55-420-054
 A. Installation of the Skin Exchanger Inlet Bypass Valve
 (1)
 Remove the blanking plugs from the disconnected line ends.

 (2)
 Install the flexible sleeve (12) on the duct (10).

 (3)
 Put the new O-ring (16) in the groove of the duct (18).

 (4)
 Install the valve (15) in the flexible sleeve (12). NOTE : The arrow that indicates the air flow points to the rear.

____

 (5)
 Make sure that the valve (15) is in the correct angular position. The electrical cable must not be too tight or too loose.

 (6)
 Install the clamp (17) and tighten to the torque value which is indicated on the clamp.

 (7)
 Put the flexible sleeve (12) in position.

 (8)
 Install and tighten the clamps (11) and (13). NOTE : Use the clamps (11) and (13) kept during the removal

____
 procedure.

 (9)
 Remove the blanking caps from the electrical connectors.

 (10)
 Make sure that the electrical connectors are clean and in the correct condition.

 (11)
 Connect the electrical connector (14).

R  **ON A/C 051-052, 
R  Subtask 21-26-55-420-054-A 
R  A. Installation of the Skin Exchanger Inlet Bypass Valve 
R  (1) Remove the blanking plugs from the disconnected line ends. 
R  (2) Install the flexible sleeve (12) on the duct (10). 
R  (3) Put the new O-ring (16) in the groove of the duct (18). 
R  (4) Install the valve (15) in the flexible sleeve (12). 
R  NOTE : The arrow that indicates the air flow points to the rear.____ 
R  (5) Make sure that the valve (15) is in the correct angular position. The 
R  electrical cable must not be too tight or too loose. 
R  (6) Install the clamp (17) and tighten to the torque value which is 
R  indicated on the clamp. 
R  (7) Put the flexible sleeve (12) in position. 
R  (8) Install and tighten the clamps (11) and (13). 
R  (9) Remove the blanking caps from the electrical connectors. 
R  (10) Make sure that the electrical connectors are clean and in the correct 
R  condition. 
R  (11) Connect the electrical connector (14). 
R  **ON A/C ALL
 Subtask 21-26-55-865-062
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit
 breaker(s):
 6HQ.

 Subtask 21-26-55-710-054
 C. Do this Test
 (1) Do an operational test of the ventilation system of the avionics equipment (Ref. TASK 21-26-00-710-001).
 NOTE : As an alternative procedure, you can do this operational test
____ without the CFDS (Ref. TASK 21-26-00-710-001).
 5. Close-up
________ Subtask 21-26-55-410-057
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the access panel 128EG (Ref. TASK 53-12-13-400-001).

 (3)
 Close the access door 824 (Ref. TASK 52-41-00-410-002).

 (4) Remove the access platform(s). Subtask 21-26-55-862-058
 B. De-energize the ground service network
 (Ref. TASK 24-42-00-862-001).

 1EFF : ALL 1 21-26-55Page 409 1 1 May 01/05R 1 1 1CES 1

 TASK 21-26-55-000-002
 Removal 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 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 21-26-55-991-003 Fig. 402
　
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