21-20-00
ALL ú ú 01 Page 1 ú Jun 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
MAIN DISTRIBUTION MANIFOLD - DESCRIPTION AND OPERATION
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General
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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 recirculation fan, filter, and check valve, a ground service connection to permit use of a service cart for supplying conditioned air, and all the sensors, bulbs, and thermal switches required for operation and monitoring of the temperature control systems.
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 pack and passenger cabin conditioned air from the right pack during normal operation. Either pack will provide conditioned air to both systems when the other pack is off. Since the control cabin does not require all air provided by the left pack during normal operation, part of its output will be mixed with the right pack supply before going to the passenger cabin.
C. The main distribution manifold is located aft of the forward cargo
compartment aft bulkhead in a pressurized area (Fig. 1).Ground Service Conditioned Air Connection (Fig. 1)
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A. A ground service connection is provided to allow use of a ground service cart for conditioned air to the cabin when airplane air conditioning is off. A check valve in the duct prevents loss of air when airplane air conditioning is on.
B. The connection is a short duct section which is fastened to the pressure skin and the duct and check valve assembly at its upper flange and has two slotted holes in its lower flange to match fasteners on the ground service cart. An access door must be opened to make the connection.
C. A swing check valve in the duct and check valve assembly opens with pressure from the ground service cart and closes when air is being supplied from the airplane air conditioning system.
Recirculation Fan
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A. A recirculation fan, check valve and filter are provided to supplement air flow dependent on demands made by switch positions of the air-conditioning control module.
B. A check valve in the duct connecting the recirculation fan to the mixing manifold prevents loss of air flow when the fan is not operating.
C. Filters prevent the ingestion of dust and debris into the air conditioning distribution system.
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21-21-00
ALL ú ú 02 Page 1 ú Nov 15/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TO PASSENGER SEE A
CABIN OVERHEAD DISTRIBUTION DUCT
TO CONTROL CABIN
FROM FORWARD CARGO COMPARTMENT TO PASSENGER CABIN
AIR COLLECTOR
ACCESS TO RECIRCULATION FAN AND FILTER
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本文鏈接地址：737-300 400 500 AMM 飛機(jī)維護(hù)手冊(cè) 空調(diào) AIR CONDITIONING 1(26)
