(19)
 Connect the electrical connector (31).

 (20)
 Make sure that the work area is clean and clear of tool(s) and other items.

 Subtask 21-43-52-865-054
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 30HN, 31HN.
 Subtask 21-43-52-710-050
 C. Test
 (1)
 Do the pre-conditioning through the HP ground connector (Ref. TASK 12-33-21-618-001) or with the APU (Ref. TASK 12-33-21-618-001).

 (2)
 Do a leak check of the pressure regulating valve and sense line connections.

 NOTE : Leaks are not permitted.
____

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

 (4)
 Do the operational test of the AFT cargo-compartment heating system (Ref. TASK 21-43-00-710-003).

 5. Close-up
________ R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 Subtask 21-43-52-410-050
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Install the access panel 197BB (Ref. TASK 53-35-13-400-002).

 (3)
 Remove the access platform(s).

 (4) Remove the warning notice(s).
 **ON A/C 301-399,

 Subtask 21-43-52-410-050-A
 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 197KB (Ref. TASK 53-35-13-400-002).

 (3)
 Remove the access platform(s).

 (4) Remove the warning notice(s).
 **ON A/C ALL

 Subtask 21-43-52-862-050
 B. De-energize the aircarft electrical circuits (Ref. TASK 24-41-00-862-002).

 AIR COOLING - DESCRIPTION AND OPERATION_______________________________________
 1. General_______
 **ON A/C 001-003, 051-054,
 (Ref. Fig. 001) 
R  **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299,
 (Ref. Fig. 001A) 
R  **ON A/C 301-399,
 (Ref. Fig. 001B) 
R  **ON A/C 401-499,
R  (Ref. Fig. 001C) 
**ON A/C 001-003, 051-054,
 The fresh air quantity for air conditioning is defined by heating and cooling requirements. Since the bleed air supply is always at a higher temperature than that required for passenger comfort, a means of cooling this air is accomplished by two air conditioning packs. Each pack includes two heat exchangers which use ambient ram air as a heat sink, and a three-wheel boot-strap air cycle machine (Compressor, turbine and fan), a high pressure water extractor circuit and a bypass valve. The two heat exchangers are attached to the cooling ram-air inlet and outlet. Each inlet and outlet have a regulator flap which operates automatically to control the cooling airflow through the heat exchangers (the inlet flap follows the outlet flap). During take off and landing phases, the ram-air inlet doors are closed to prevent ingestion of foreign matter which may damage or contaminate the heat exchangers.
 For the complete description of the environmental control system refer to 21-60-00.

 Air Cooling - Schematic Figure 001 
R 1EFF : 1 1 1CES  001-003, 051-054,  1 111 21-50-00 Page 2 May 01/05

 Air Cooling - Schematic
 Figure 001A

R 1EFF : 004-049, 055-099, 101-149, 151-199, 1 21-50-00Page 3 1201-299, 1Aug 01/05 1 1 1CES 1

 Air Cooling - Schematic 
R  Figure 001B 
R 1EFF :  301-399,  1  21-50-00 Page 4 
1  1  Aug 01/05
 1  1
 1CES  1

 Air Cooling - Schematic 
R  Figure 001C 
R 1EFF :  401-499,  1  21-50-00 Page 5 
1  1  Aug 01/05
 1  1
 1CES  1

 A. Flow Control and Indication (Ref. 21-51-00) The flow control and indication system controls the quantity of air supplied to the air conditioning packs.
 B. Air Cooling System (Ref. 21-52-00) The air cooling system cools the hot bleed air and then delivers it to the distribution system.
 C. Pack Cooling - Air Control (Ref. 21-53-00) The pack cooling air control is done with components of the pack temperature control system (Ref. 21-61-00).
 D. Emergency Ram-Air Inlet (Ref. 21-55-00) The emergency ram-air inlet provides ram-air for ventilation of the aircraft in case of both packs OFF (This function can only be used during unpressurized flight).
　
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