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Operational test
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LRU replacement test.
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AIR CONDITIONING -DISTRIBUTION -GROUND TESTS
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AIR CONDITIONING -MAIN AIR DISTRIBUTION -DUCT
General
The main air distribution system moves air from the pack or ground conditioned air connector to the mix manifold and to the flight deck conditioned air distribution duct.
Pack Outlet Muffler
A muffler in the pack outlet duct decreases noise in the main air distribution system.
Ground Conditioned Air Connector
The ground conditioned air connector lets ground carts supply conditioned air to the cabin zones and the flight deck. A check valve in the connector closes the opening when the pack supplies conditioned air.
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AIR CONDITIONING -MAIN AIR DISTRIBUTION -DUCT
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AIR CONDITIONING -MAIN AIR DISTRIBUTION -MIX MANIFOLD
Purpose
The mix manifold mixes fresh air from the main air distribution duct (ground conditioned air or pack air) and cabin air from the lower recirculation system.
The manifold usually gives air to the passenger cabin conditioned air distribution ducts. The manifold can also give air to the flight deck conditioned air distribution duct when the left air conditioning pack is off.
Location
The mix manifold is aft of the forward cargo compartment in the mix bay area. You remove the cargo compartment end wall to get access to the manifold.
Physical Description
The outer diameter of the mix manifold is approximately 26 inches (66 cm) and is approximately 85 inches (216 cm) high. The manifold has a lower and upper part. The lower part has these features:
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A connection that is the same for the right main air distribution duct and right lower air recirculation system
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A connection for the left main air distribution duct
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A connection for the left lower air recirculation system
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Ice collection screen (internal)
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Water collector (internal)
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Water drain (3 places).
The ice collection screen is in the bottom part of the manifold. It collects ice that can form when the fresh air from the packs or a ground conditioned air source mix with hot humid recirculated air.
The manifold has three water drains at these locations:
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Forward side
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Aft side (not shown)
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Bottom (not shown).
The water drains let water move from inside the manifold to the bilge area below the manifold.
The upper part has these features:
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Four connectors for the passenger cabin conditioned air distribution ducts
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Temperature sensors for the air conditioning pack and mix manifold temperature control system.
See the pack cooling and mix manifold temperature control section for more information about the mix manifold temperature sensors (SECTION 21-52).
The manifold is kevlar.
The left main air distribution duct (air from left pack or a ground conditioned air source) gives air to the mix manifold and to the flight deck conditioned air distribution duct.
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
AIR CONDITIONING -FLIGHT DECK CONDITIONED AIR DISTRIBUTION
Purpose There are ducts in all areas. Two mufflers are in the left sidewall area of the forward cargo compartment, aft of the cargo door. The flight deck conditioned air distribution system moves air
Air outlets are in the flight compartment. from the left pack to the flight compartment. If the left pack is off, the system moves air from the mix manifold to the flight compartment.
Physical Description
The flight deck conditioned air distribution system has these components:
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