R  - 19 - Comp. Overheat Sensor - 20 - Water Extractor Temp. Sensor - 21 - Pack Discharge Sensor - 22 - Comp. Pneumatic Overheat Sensor - 23 - Pack Outlet Pneumatic Sensor - 24 - Back Up Solenoid
R R R R R R R R R R  (4) Cockpit and Cabin Temperature Control (Ref. 21-63-00) - 25 - Trim Air Pressure Reg. Valve - 26 - Pressure Switch - 27 - Trim Air Check Valve - 28 - Trim Air Valve - 29 - Zone Controller - 30 - Zone Temperature Sensor - 31 - Duct Temperature Sensor - 32 - Mixer Temperature Sensor - 33 - Zone Temperature Selector 
**ON A/C 301-399,
 C. Overall Air Cooling and Temperature Control 
R  **ON A/C 301-302, 
R  (Ref. Fig. 004D) 
R  **ON A/C 303-399,
 (Ref. Fig. 004E) 
R  **ON A/C 301-399,
 The components of the different systems which make up the overall air cooling and temperature control are listed below:
 (1) Flow Control and Indicating (Ref. 21-51-00) - 1 - Flow Control Valve - 2 - Pressure Sensor - 3 - Mixer Flap Actuator - 4 - ECON FLOW Pushbutton Switch 

R 1EFF : 106-149, 159-199, 211-299, 301-399, 1 21-60-00Page 37 1 1 Aug 01/05 1 1 1CES 1

 (2) Air Cooling System (Ref. 21-52-00)
 - 5 - Air Cycle Machine
 - 6 - Water Extractor
 - 7 - Reheater
 - 8 - Condenser
 - 9 - Primary Heat Exchanger
 - 10 - Main Heat Exchanger
 - 11 - Water Injector
 - 12 - Downstream Check Valve
 (3) Pack Temperature Control (Ref. 21-61-00)
 - 13 - Pack Controller
 - 14 - Bypass Valve
 - 15 - Anti-ice Valve
 - 16 - Ram Air Inlet Actuator
 - 17 - Pack Inlet-Pressure Sensor
 - 18 - Comp. Discharge Temp. Sensor
 - 19 - Comp. Overheat Sensor
 - 20 - Water Extractor Temp. Sensor
 - 21 - Pack Discharge Sensor
 - 22 - Comp. Pneumatic Overheat Sensor
 - 23 - Pack Outlet Pneumatic Sensor 
R  - 24 - Back Up Solenoid
 (4) Cockpit and Cabin Temperature Control (Ref. 21-63-00) 
R  - 25 - Trim Air Pressure Reg. Valve 
R  - 26 - Pressure Switch 
R  - 27 - Trim Air Check Valve 
R  - 28 - Trim Air Valve 
R  - 29 - Zone Controller 
R  - 30 - Zone Temperature Sensor 
R  - 31 - Duct Temperature Sensor 
R  - 32 - Mixer Temperature Sensor 
R  - 33 - Zone Temperature Selector 
R 
R  **ON A/C 401-499, 
R  C. Overall Air Cooling and Temperature Control 
R  (Ref. Fig. 004F) 
R  The components of the different systems which make up the overall air 
R  cooling and temperature control are listed below: 

R 1EFF : 301-399, 401-499, 1 21-60-00Page 38 1 1 Aug 01/05 1 1 1CES 1

R  (1) Flow Control and Indicating (Ref. 21-51-00) 
R  - 1 - Flow Control Valve 
R  - 2 - Pack Inlet Pressure Sensor 
R  - 3 - Differential Pressure Sensor 
R  - 4 - Mixer Flap Actuator 
R  - 5 - Flow Selector 
R 
R  (2) Air Cooling System (Ref. 21-52-00) 
R  - 6 - Air Cycle Machine 
R  - 7 - Water Extractor 
R  - 8 - Reheater 
R  - 9 - Condenser 
R  - 10 - Primary Heat Exchanger 
R  - 11 - Main Heat Exchanger 
R  - 12 - Water Injector 
R  - 13 - Downstream Check Valve 
R  (3) Pack Temperature Control (Ref. 21-61-00) 
R  - 14 - Air Conditioning System Controller (ACSC) 
R  - 15 - Bypass Valve 
R  - 17 - Ram Air Inlet Actuator 
R  - 18 - Compressor Overheat Sensor 
R  - 19 - Water Extractor Temp. Sensor 
R  - 20 - Pack Outlet Temp. Sensor 
R  - 21 - Pack Discharge Pressure Sensor 
R  (4) Cockpit and Cabin Temperature Control (Ref. 21-63-00) 
R  - 22 - Trim Air Pressure Reg. Valve 
R  - 23 - Trim Air Overpressure Switch 
R  - 24 - Trim Air Check Valve 
R  - 25 - Trim Air Valve 
R  - 26 - Cabin Temperature Sensor 
R  - 27 - Duct Temperature Sensor 
R  - 28 - Mixer Temperature Sensor 
R  - 29 - Zone Temperature Selector

 PACK TEMPERATURE CONTROL - DESCRIPTION AND OPERATION
____________________________________________________
 1. General
　
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