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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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