4. Procedure
_________
 (Ref. Fig. 401/TASK 49-52-54-991-001) Subtask 49-52-54-020-050
 A. Removal of the Compartment Cooling Valve. NOTE : To remove the cooling duct only, release clamp (4), remove the
____ bolts (5) and remove the duct (1).
 (1)
 Disconnect the pipe (8) from the cooling valve (3).

 (2)
 Disconnect the clamps (2) and (4) from the cooling ducts (1) and (9).

 (3)
 Remove the duct (1) from the cooling valve (3).

 (4)
 Remove the two bolts (5) and remove the cooling valve (3).

 (5)
 Put blanking plugs on the disconnected line ends.

 Cooling Valve Figure 401/TASK 49-52-54-991-001 
R  EFF :  106-106, 108-149, 211-299, 301-399,  49-52-54 Page 404 Aug 01/05
 CES 

 TASK 49-52-54-400-001
 Installation of the Compartment Cooling Valve and Cooling Duct (APS 3200)
 WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS
_______ WHEN YOU DO THE MAINTENANCE TASK(S).
 1. Reason for the Job
__________________
 This procedure is only applicable on APU's with a compartment cooling valve installed. These are APU's that have the Mod. 6 Dot mark on the modification plate intact.
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific Torque Wrench : range 5.00 to 35.00 lbf.in
 (0.05
 to 0.40 m.daN) No specific Torque Wrench : range 36.00 to 220.00 lbf.in

 (0.40 to 2.60 m.daN)

 B.
 Referenced Information

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized
 Configuration before Maintenance Action 49-00-00-860-005 APU Start by External Power (APS 3200) 49-00-00-860-006 APU Shutdown by External Power (APS 3200) 52-41-00-010-001 Open the APU Doors for Access 52-41-00-410-001 Close the APU Doors after Access 49-52-54-991-001 Fig. 401

 3. Job Set-up
__________ Subtask 49-52-54-860-051
 A. Aircraft Maintenance Configuration
 (1)
 Make sure that the aircraft electrical circuits are energized (Ref. TASK 24-41-00-861-002).

 (2)
 On the panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.

 (3)
 Make sure that there is a warning notice in the cockpit to tell persons not to start the APU.

 (4)
 Make sure that hydraulic systems are depressurized
 (Ref. TASK 29-00-00-864-001).

 (5)
 Make sure that the access platform is in position below the APU compartment.

 (6)
 Make sure that the APU access doors are open (Ref. TASK 52-41-00-010-001).

 (7)
 Make sure that the LIGHT control switch 11LJ is set to the on position.

 Subtask 49-52-54-865-051
 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41

 4. Procedure
_________
 (Ref. Fig. 401/TASK 49-52-54-991-001) Subtask 49-52-54-020-052
 A. Preparation of Replacement Component
 (1) Clean and inspect the valve interfaces for damage.
 (2)
 Clean and inspect the ducts and clamps for damage, replace as needed. Subtask 49-52-54-420-050

 B.
 Installation of the Cooling Valve CAUTION : DO NOT TORQUE THE V-CLAMP(S) TO MORE THAN THE SPECIFIED VALUE.

_______
 YOU CAN DAMAGE THE FLANGE SURFACES IF YOU DO.

 NOTE : To install the cooling duct only, do steps (7) thru (14).
____
 (1)
 Position clamp (4) on duct (9) and locate cooling valve (3) on the duct (9).

 (2)
 Install the cooling valve (3) on the fan with the bolts (5).

 (3)
 Attach the pipe (8) to the union (7).

 (4)
　
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