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 controller modulates the by-pass valve and the ram air inlet doors in a
 predetermined sequence. The sequence is a compromise between a minimizing
 ram air flow while also maintaining adequate heat transfer rates and
 satisfactory pack air flow.
 Additionally the by-pass valve always maintains a minimum ACM flow to
 keep the ACM idling during all operations.
 In a full cooling mode, the ram air inlet doors are fully open and the
 turbine by-pass valve is fully closed.
 In a full heating mode, the ram air inlet doors are nearly closed and the
 by-pass valve is fully open.
 Between these two extreme conditions, the above mentioned schedule is in
 effect.
 In the mixer unit, the pack discharge air is mixed with the cabin
 recirculation air. The combined air flow supplies the zone ducts where
 hot trim air is added individually for each of the three zones.
 The air flow demand is selected by the flight crew with the flow selector
 which allows a flow setting of 80% or 100%.
 The zone controller manipulates the flow between 80% and 100% if the zone
 duct temperature is limited at its high or low value. It tranmits the
 determined flow demand to the pack controllers which modulate the flow
 servo of the flow control valve. 
R  **ON A/C 401-499, 
R  To achieve the zone demanded pack discharge-temperature, the ACSC 
R  modulates the by-pass valve and the ram air inlet door in a predetermined 
R  sequence. The sequence is a compromise between a minimized ram air flow 
R  while also maintaining adequate heat transfer rates and satisfactory pack 
R  air flow. 
R  Additionally the by-pass valve always maintains a minimum ACM flow to 
R  keep the ACM idling during all operations. 
R  In a full cooling mode, the ram air inlet doors are fully open and the 
R  turbine by-pass valve is fully closed. 
R  In a full heating mode, the ram air inlet doors are nearly closed and the 
R  by-pass valve is fully open. 

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R  Between these two extreme conditions, the above mentioned schedule is in 
R  effect. 
R  In the mixer unit, the pack discharge air is mixed with the cabin 
R  recirculated air. The combined air flow supplies the zone ducts where hot 
R  trim air is added individually for each of the three zones. But one of 
R  the trim air valves is always closed. 
R  The air flow demand is selected by the flight crew with the flow selector 
R  which allows a flow setting of 100% or 120%.
 **ON A/C 001-003, 053-054,
 C. Overall Air Cooling and Temperature Control
 (Ref. Fig. 004)
 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 - Flow Selector
 (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 - Ram Air Outlet Actuator
 - 18 - Pack Inlet-Pressure Sensor
 - 19 - Bleed Temp. Sensor
 - 20 - Comp. Discharge Temp. Sensor
 - 21 - Comp. Overheat Sensor
 - 22 - Water Extractor Temp. Sensor
 - 23 - Pack Discharge Sensor
 - 24 - Comp. Pneumatic Overheat Sensor
 - 25 - Pack Outlet Pneumatic Sensor 

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 (4) Cockpit and Cabin Temperature Control (Ref. 21-63-00)
 -26 - Trim Air Pressure Reg. Valve
 -27 - Pressure Switch
 -28 - Trim Air Check Valve
 -29 - Trim Air Valve
 -30 - Zone Controller
 -31 - Zone Temperature Sensor
 -32 - Duct Temperature Sensor
 -33 - Mixer Temperature Sensor
　
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