Air Mix Valve ............................................................................................................ 21-61-11 Removal/Installation
Contents 21 Aug 01/75
Page 6 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Subject  Subject No. 
Passenger Cabin Temperature Sensor ................................................................... Removal/Installation  21-61-31 
Passenger Cabin Temperature Sensor Fan. ........................................................... Removal/Installation  *[4] *[5]  21-61-34 21-61-35 
Duct Temperature Sensors...................................................................................... Removal/Installation  21-61-41 
Duct Overheat Switches .......................................................................................... Removal/Installation  21-61-51 
Control Cabin Temperature Sensor......................................................................... Removal/Installation  21-61-61 
Mix Valve Position Indicator Control Unit................................................................. Description and Operation Adjustment/Test  21-61-71 
TEMPERATURE INDICATING SYSTEM ................................................................... Description and Operation Air Temp Selector Switch Temperature Indicator  21-62-0 
Cabin Air Supply Temperature Bulb ........................................................................ Removal/Installation  21-62-11 
Passenger Cabin Temperature Bulb ....................................................................... Removal/Installation Cleaning/Painting (Ref 21-61-0)  21-62-21 
*[1] *[2] *[3] *[4] *[5]  PASSENGER/CARGO CONVERTIBLE AIRPLANES STANDARD PASSENGER AIRPLANES CAC B2501 thru B2505 CARRYALL STOWAGE COMPARTMENT TYPE INTERIOR AIRPLANES ADVANCED TECHNOLOGY INTERIOR 

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Oct 20/89  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Contents 21 Page 7 

AIR CONDITIONING - DESCRIPTION AND OPERATION
1. General
A.  The air conditioning systems provide conditioned air to the control cabin, passenger cabin, electronic equipment compartment, forward cargo compartment, air conditioning distribution bay and aft cargo compartment. Air supply to the air conditioning system is furnished by the pneumatic system from either engine bleed air or the auxiliary power unit (APU) in flight, and from engine bleed air, the auxiliary power unit, a ground pneumatic supply cart, or from a ground conditioned air supply cart during ground operation (Fig. 1). Chapter 36, Pneumatic, describes air supply to the pneumatic manifold. Part of the warm air supply from the engines or pneumatic cart is passed through the air cycle system to be cooled. The cold air is then mixed with the remainder of the warm air as required to obtain the conditioned air temperature called for by the temperature control system. This conditioned air then passes into the control and passenger cabins through the distribution system. Cabin air is exhausted a number of ways. Galley and toilet vents, the ground service air conditioning connection check valve, condensate drains, and the water separator drains, for example, exhaust cabin air without regard for cabin pressurization control requirements. The combined flow from all outlets other than the pressurization control outflow valves is limited to a value less than that which enters the cabin from the air conditioning system. The outflow valves are regulated to exhaust only that additional quantity of air required to maintain the desired pressure in the cabin. For a more detailed description of the electrical/electronic equipment cooling, refer to Equipment Cooling System - Description and Operation.
B.  This chapter considers the air conditioning system as including five subsystems: compression, distribution, pressurization control, cooling, and temperature control. Figure 2 shows the flow of air through the airplane for air conditioning and pressurization.
2.  Compression
A.  This subsystem describes the equipment and methods used to regulate flow of air to the air conditioning system. Regulated flow is required to maintain adequate air supply and to prevent excessive flow. Undersupply may limit pressurization of the airplane, while over supply may cause the air cycle system to overheat.
500 
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Air Conditioning System Schematic  591 
21-00  Figure 1 (Sheet 1)  Feb 20/85 
Page 2 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

E63102
541  Air Conditioning System Schematic 
　
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