Engine Bleed Air Cleaner Installation  501 
21-12-11  Figure 401  May 15/70 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

AIR CLEANER PURGE VALVE - REMOVAL/INSTALLATION
1.  General
A.  The air cleaner purge valve is located on the outboard side of the ram air exhaust duct downstream of the turbofan valve. The valve installations are similar for both sides. When removing or installing purge valve exercise care not to dent or damage beads on duct flanges as leaks may develop at joint (Fig. 401).
2.  Remove Purge Valve
A.  Open TURBOFAN VALVE circuit breaker on P6 circuit breaker panel.
B.  Open air conditioning equipment bay doors.
C.  Disconnect electrical connector from valve solenoid.
D.  Disconnect sensing line from purge valve.
E.  Disconnect purge air duct from valve.
F.  Remove V-band clamps from each end of valve.
G.  Remove valve.
3.  Install Purge Valve
A.  Position purge valve between duct flanges.
B.  Install and tighten two V-band clamps.
C.  Connect purge air duct to valve.
D.  Connect sensing line to purge valve.
E.  Connect electrical connector.
F.  Close TURBOFAN VALVE circuit breaker.
G.  Functionally test system and check for air leaks at joints during test (Ref Air Cleaner System -Adjustment/Test).
H.  Close air conditioning equipment bay doors.
543 
Feb 01/76  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-12-21 Page 401 

Air Cleaner Purge Valve Installation  501 
21-12-21  Figure 401  May 15/70 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

DISTRIBUTION - DESCRIPTION AND OPERATION
1.  General
A.  The air conditioning distribution systems are responsible for moving all air into the passenger and control cabins. Two different types of air are sent to the cabins by completely unrelated distribution systems. The conditioned air distribution systems provide fully conditioned air to both cabins. The individual air (Gasper) distribution system supplies cold air to both cabins.
B.  Conditioned air distribution starts with the main distribution manifold. From the distribution manifold two separate systems, control cabin conditioned air and passenger cabin conditioned air, are responsible for getting air to the cabins.
C.  The control cabin air distribution system receives air from the left end of the main distribution duct and releases it into the control cabin from several outlets. The outlets are located to provide optimum flow patterns in the cabin.
D.  The passenger cabin conditioned air distribution system takes the remainder of air supplied to the main distribution manifold and delivers it to the passenger cabin. Air is released directly into the cabin from an overhead duct.
E.  The gasper distribution system handles only cold air and receives its air directly from the air cycle systems. The air is delivered to each passenger and crewmember and is adjustable for quantity at each outlet.
500 
Nov 15/67  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  21-20-0 Page 1 

MAIN DISTRIBUTION MANIFOLD - DESCRIPTION AND OPERATION
1.  General
A.  The primary function of the main distribution manifold is to provide a gathering place for all conditioned air required for the airplane. The manifold includes a pressure relief valve to protect distribution ducts against overpressure, a ground service connection to permit use of a service cart for supplying conditioned air, a main cabin airflow shutoff valve (Passenger/Cargo Convertible Airplanes), and most of the sensors, bulbs, and thermal switches required for operation and monitoring of the temperature control systems (Ref 21-61-0).
B.  Conditioned air supply ducts to the manifold, and distribution ducts from the manifold, are positioned to provide control cabin conditioned air from the left air cycle system and passenger cabin conditioned air from the right air cycle system during normal operation. Either system will provide conditioned air to both systems when the other system is off. Since the control cabin does not require all air provided by the left air cycle system during normal operation, part of its output will be mixed with the right system supply before going to the passenger cabin. A temperature bulb in the vicinity of the passenger cabin distribution outlet transmits duct temperature to an indicator in the control cabin. Although this temperature may be the same as control cabin air, it is not necessarily so, because of separate temperature control systems for the two cabins.
　
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