R **ON A/C 401-499,
 Subtask 21-63-51-865-053-A
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 49HH, 50HH, 51HH, 52HH, 53HH, 54HH, 55HH, 56HH.
 **ON A/C ALL
 Subtask 21-63-51-710-050
 C. Test
 (1)
 Do the pre-conditioning through the HP ground connector or with the APU (Ref. TASK 12-33-21-618-001) (Ref. TASK 12-33-21-618-001).

 (2)
 Do a leak check of the trim air valve connections. NOTE : Leaks are not permitted.

____

 (3)
 After approx. 15 minutes stop the pre-conditioning (Ref. TASK 12-33-21-618-001) (Ref. TASK 12-33-21-618-001).

 (4)
 Do the operational test of the cockpit and cabin temperature control system (Ref. TASK 21-63-00-710-004)>.

 Subtask 21-63-51-420-052
 D. Installation of the Insulation
 (1)
 FOR 11HK

 (a)
 Make sure that the insulation (10) is in a good condition. If necessary replace the insulation (10).

 (b)
 Put the insulation (10) in position and install the new cable-ties (1).

 (c)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 FOR 12HK

 (a)
 Make sure that the insulation (3) is in a good condition. If necessary replace the insulation (3).

 (b)
 Put the insulation (3) in position and install the new cable-ties (1).

 (c)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (3)
 FOR 13HK

 (a)
 Make sure that the insulation (2) is in a good condition. If necessary replace the insulation (2).

 (b)
 Put the insulation (2) in position and install the new cable-ties (1).

 (c)
 Make sure that the work area is clean and clear of tool(s) and other items.

 5. Close-up
________ Subtask 21-63-51-410-050
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the access panels 131NW and 131PW (Ref. TASK 25-54-12-400-001).

 (3)
 Remove the access platform(s).

 (4)
 Close the Fwd cargo-compartment door 825 (Ref. TASK 52-30-00-860-002).

 Subtask 21-63-51-862-050
 B. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).

 VALVE - PRESSURE REGULATING (14HK) - REMOVAL/INSTALLATION
_________________________________________________________ TASK 21-63-52-000-001 Removal of the Pressure Regulating Valve 14HK WARNING : MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM
_______ FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE. HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.
 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 2 m (6 ft. 7 in.)

 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the
 External Power 25-54-12-000-001 Removal of the FWD Cargo Compartment Partition FR34 52-30-00-860-001 Open the FWD or AFT Cargo-Compartment Door with the
 Yellow Electric Pump 21-63-52-991-001 Fig. 401
 3. Job Set-up
__________ Subtask 21-63-52-861-050
 A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).

 Subtask 21-63-52-865-050
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
R  **ON A/C 401-499,
 49VU AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC  52HH  D08 
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 122VU AIR COND/ZONE TEMP CTL/28VDC/SYS2 122VU AIR COND/ZONE TEMP CTL/28VDC/SYS1 122VU AIR COND/ZONE TEMP CTL/115VAC/SYS2 122VU AIR COND/ZONE TEMP CTL/115VAC/SYS1  4HK 3HK 2HK 1HK  V20V19V18V17 
　
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