(12)
 Remove the blanking caps from the electrical connectors.

 (13)
 Make sure that the electrical connectors are clean and in the correct condition.

 (14)
 Connect the electrical connector (3).

 (15)
 Make sure that the work area is clean and clear of tool(s) and other items.

 Subtask 21-51-52-865-052
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 122VU AIR COND/FLOW/MIXER/FLAP 3HB V22 122VU AIR COND/ZONE TEMP CTL/28VDC/SYS2 4HK V20 122VU AIR COND/ZONE TEMP CTL/28VDC/SYS1 3HK V19 122VU AIR COND/ZONE TEMP CTL/115VAC/SYS2 2HK V18 122VU AIR COND/ZONE TEMP CTL/115VAC/SYS1 1HK V17
 **ON A/C ALL
 122VU AIR COND/RECIRC FAN/R/CTL 11HG W20 122VU AIR COND/RECIRC FAN/R/SPLY 3HG W18 122VU AIR COND/RECIRC FAN/L/CTL 2HG X20 122VU AIR COND/RECIRC FAN/L/SPLY 1HG X18
 Subtask 21-51-52-710-050
 C. Do the operational test of the flow control and indicating system (Ref. TASK 21-51-00-710-002).

 5. Close-up
________ Subtask 21-51-52-410-050
 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 132PW and 131NW (Ref. TASK 25-54-12-400-001).

 (3)
 Close the FWD cargo compartment door 825 (Ref. TASK 52-30-00-860-002).

 (4) Remove the access platform(s). Subtask 21-51-52-862-050
 B. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).

 AIR COOLING SYSTEM - DESCRIPTION AND OPERATION
______________________________________________
 1. General
_______
 The two air conditioning packs decrease the temperature and the water
 contained in the hot bleed air from the pneumatic system. Heat exchangers
 decrease the temperature of the air. An air-cycle machine first compresses
 the air and then expands it. A condenser condenses the water in the air and
 a water extractor removes the water.
 2. Component Location
__________________

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 (Ref. Fig. 001)

R **ON A/C 401-499,
 (Ref. Fig. 001A)
 **ON A/C ALL
 -------------------------------------------------------------------------------FIN FUNCTIONAL DESIGNATION PANEL ZONE ACCESS ATA DOOR REF.
 -------------------------------------------------------------------------------10HM AIR CONDITIONING PACK 1 191 191KB 21-52-41 10HM1 AIR - CYCLE MACHINE P1 191 191KB 21-52-21 10HM2 CONDENSER P1 191 191KB 21-51-32 10HM3 REHEATER P1 191 191KB 21-52-31 10HM5 FAN PLENUM P1 191 191KB 21-52-22 10HM6 PRIMARY HEAT EXCHANGER P1 191 191KB 21-52-25 10HM7 MAIN HEAT EXCHANGER P1 191 191KB 21-52-26 10HM8 WATER EXTRACTOR P1 191 191KB 21-52-16
R 11HM AIR CONDITIONING PACK 2 192 192KB 21-52-41 11HM1 AIR - CYCLE MACHINE P2 192 192KB 21-52-21 11HM2 CONDENSER P2 192 192KB 21-52-32 11HM3 REHEATER P2 192 192KB 21-52-31 11HM5 FAN PLENUM P2 192 192KB 21-52-22 11HM6 PRIMARY HEAT EXCHANGER P2 192 192KB 21-52-25 11HM7 MAIN HEAT EXCHANGER P2 192 192KB 21-52-26 11HM8 WATER EXTRACTOR P2 192 192KB 21-52-16

R 15HM CHECK VALVE. DOWNSTREAM P1 191 191KB 21-52-43

 Air Cooling System - Component Location
 Figure 001

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 21-52-00Page 2 1201-299, 301-399, 1Aug 01/05 1 1 1CES 1

 Air Cooling System - Component Location
 Figure 001A 
R 1EFF :  401-499,  1  21-52-00 Page 3 
1  1  Aug 01/05
 1  1
 1CES  1

 -------------------------------------------------------------------------------FIN FUNCTIONAL DESIGNATION PANEL ZONE ACCESS ATA DOOR REF.
 -------------------------------------------------------------------------------16HM CHECK VALVE. DOWNSTREAM P2 192 192KB 21-52-43 20HM WATER INJECTOR P1 191 191KB 21-52-42 21HM WATER INJECTOR P2 192 192KB 21-52-42
 3. System Description
__________________
 **ON A/C 001-003, 051-054,
 (Ref. Fig. 002)

R **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 (Ref. Fig. 002A)
 **ON A/C ALL
 (Ref. Fig. 003)
 The air conditioning packs 10HM (11HM) are identical and are installed in
　
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