Subtask 21-63-00-865-054
 C. 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 
R  **ON A/C 401-499,
R R  122VU AIR COND/TEMP CTL SYS 2/CHAN A/115VAC 122VU AIR COND/TEMP CTL SYS 2/CHAN A/28VDC 122VU AIR COND/TEMP CTL SYS 1/CHAN A/115VAC 122VU AIR COND/TEMP CTL SYS 1/CHAN A/28VDC 122VU AIR COND/TEMP CTL SYS 2/CHAN B/28VDC 122VU AIR COND/TEMP CTL SYS 2/CHAN B/115VAC 122VU AIR COND/TEMP CTL SYS 1/CHAN B/115VAC  53HH 55HH 49HH 51HH 56HH 54HH 50HH  W22W21X22X21 Y21Y20Y18 
**ON A/C ALL
 4. Procedure_________
 Subtask 21-63-00-040-051
 A. Deactivation of the Pressure Regulating Valve
 (1) Turn the manual override lever (3) to the closed position and safety with lockwire-corrosion resistant steel 0.8 mm (0.0314 in.) dia.
 (2) Disconnect the electrical connector 14HK-C (1) from the pressure regulating valve (2).

 (3)
 Put blanking caps on the disconnected electrical connectors.

 (4)
 Temporarily attach the disconnected electrical connector 14HK-C (1) to the aircraft structure.

 5. Close-up
________
 Subtask 21-63-00-410-051

 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 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).

 (5) Make an entry in the log book to record the deactivation. R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 Subtask 21-63-00-865-065
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1HK, 2HK, 3HK, 4HK.
R **ON A/C 401-499,
 Subtask 21-63-00-865-065-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 21-63-00-862-051
 C. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
 1EFF : ALL 1 21-63-00Page 418 1 1 Aug 01/05R 1 1 1CES 1

 TASK 21-63-00-440-002
 Reactivation of the Hot-Air Pressure-Regulating Valve
 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
__________________
 Refer to the MMEL TASK: 21-63-03 a)
 Cockpit and Cabin Temperature Control
 Hot Air Pressure Regulating Valve

 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
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 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied
 from the External Power 25-54-12-000-001 Removal of the FWD Cargo Compartment Partition FR34 25-54-12-400-001 Installation 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 52-30-00-860-002 Close the FWD or AFT Cargo-Compartment Door with the Yellow Electric Pump R TSM ATA 21 (for corrective action)

 3. Job Set-up
__________
 Subtask 21-63-00-861-053

 A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002). Subtask 21-63-00-010-055
 B. Get Access WARNING : DO NOT OPEN OR GO NEAR PRESSURE-SEALED DOORS WHEN THE AIRCRAFT
　
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