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21-22-11
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
ú
ú S 868-037
ú (3) Remove pneumatic power (AMM 36-05-00/201).
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ú S 868-038
ú (4) Put the L PACK switch on the P5-10 panel on the forward overhead
ú panel to OFF.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-22-11
ALL ú ú 01.1 Page 810 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
1.
2.
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A
737-300/400/500MAINTENANCE MANUAL
PASSENGER CABIN CONDITIONED AIR DISTRIBUTION SYSTEM -
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DESCRIPTION AND OPERATION
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General
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A. The passenger cabin conditioned air distribution system consists of the main distribution manifold, distribution manifold duct assembly, riser ducts, overhead distribution duct and diffuser outlets.
B. Conditioned air for the passenger cabin originates in the main distribution manifold. From the mixing chamber, conditioned air is ducted through the distribution manifold duct to both sides of the airplane to riser ducts in the cabin sidewall. The riser ducts supply conditioned air to the overhead distribution duct (Fig. 1.)
C. The overhead distribution duct is mounted along the center line of the airplane, extending forward and aft the full length of the passenger cabin. Air is directed into the passenger cabin through a nozzle which extends the length of the overhead duct and from diffuser outlets located in alternate window bays. Temperature of the conditioned air is automatically controlled (Refer 21-61-00).
D. Passenger cabin exhaust air flows around the walls of the cargo compartments and is discharged overboard through the pressurization control system outflow valves. A small amount of air is exhausted directly overboard from the galley and lavatory vents.
Overhead Supply Riser Ducts
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A. Attached to the distribution manifold duct in the distribution bay, riser ducts go up both walls to supply conditioned air to the overhead distribution duct. Flexible ducts connect to the distribution manifold duct assembly and the overhead distribution duct. The flexible ducts are attached to the overhead supply riser ducts with tape or a clamp.
Overhead Distribution Duct and Diffusers
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A. The overhead distribution duct extends from the forward to the aft end of the curved ceiling along the airplane centerline. Brackets on the upper surface of the duct attach it to the airplane structure. On the upper surface of the overhead duct at approximately midcabin position is a flexible duct panel. The flexible panel provides easy access to the upper anticollision light (AMM 33-40-00/001).
B. Conditioned air is directed into the passenger cabin through a nozzle which extends the length of the overhead duct and from diffuser outlets below the PSU's at alternate window bays. Fig. 2 shows the airflow of conditioned air in the passenger cabin.
C. On some airplanes, at the aft end of the cabin, air enters the cabin through grilles on either side of the ceiling light fixture.
D. Some airplanes have accoustic baffles installed at the riser inlet section to decrease air noise. On some airplanes the accoustic baffle is installed the full length of the overhead duct.
Passenger Cabin Air Exhaust
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A. Air from the passenger cabin is exhausted through foot level grilles in the main cabin sidewall and is discharged overboard through cabin pressurization and forward outflow valves.
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