*
Forward equipment cooling system
*
Bulk cargo ventilation system.
See the passenger compartment section for more information about the return air grills and sidewall panels (SECTION 21-20).
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AIR CONDITIONING -PASSENGER CABIN CONDITIONED AIR DISTRIBUTION -PASSENGER CABIN AREA
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777 AIRCRAFT MAINTENANCE MANUAL
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
AIR CONDITIONING -RECIRCULATION -INTRODUCTION
Purpose
The recirculation system puts cabin air back in the air conditioning distribution system.
General Description
Upper recirculation fans, above the passenger compartment ceiling pull in cabin air and put the air back in the overhead distribution ducts. Lower recirculation fans, aft of the forward cargo compartment pull in cabin air and put the air in the mix manifold.
The upper and lower recirculation fan switches on the air conditioning panel enable the operation of these fans.
The right cabin temperature controller (CTC) supplies usual control for all recirculation fans. The left CTC supplies backup control.
The left and right ECSMCs monitor for fan overheat conditions.
ELMS controls power to the fans. If the forward or aft cargo fire arm switches are in the ARMED position, the ELMS and the CTC turn off the lower fans.
The CTCs get information about airplane conditions from these systems/components:
*
Air ground system (AGS)
*
Electrical load management system (ELMS), load shed and power status
*
Airplane information management system (AIMS), cruise clamp information
*
Air supply cabin pressure controllers (ASCPC), pack flow schedule.
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AIR CONDITIONING -RECIRCULATION -INTRODUCTION
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AIR CONDITIONING -RECIRCULATION -LOWER RECIRCULATION FANS AND FILTERS
Purpose
The lower recirculation fans put cabin air back in the distribution system. The air goes through filters at the inlets of the fans.
Physical Description
The fans are axial flow type with a three-phase electric motor. A check valve is part of the fan.
There are four interchangeable lower recirculation fan filters. The filters are a paper type. The filters for the upper and lower recirculation fans are interchangeable.
Location
The fans and filters are aft of the forward cargo compartment in the mix bay area. You remove the cargo compartment end wall to get access to the fans and filters.
Training Information Point
The fans are interchangeable with each other.
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AIR CONDITIONING -RECIRCULATION -LOWER RECIRCULATION FANS AND FILTERS
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AIR CONDITIONING -RECIRCULATION -UPPER RECIRCULATION FANS AND FILTERS
Purpose
The upper recirculation fans put cabin air back in the overhead conditioned air distribution ducts. The air goes through filters at the inlets of the fans.
Physical Description
The fans are axial flow type with a three-phase electric motor. A check valve is part of the fan.
There are four interchangeable upper recirculation fan filters. The filters are a paper type. The filters for the upper and lower recirculation fans are interchangeable.
Location
The upper recirculation fans and filters are on the right side of the airplane above the passenger compartment ceiling.
The forward upper recirculation fan and filters are adjacent to door 2 above the center overhead bins.
The aft upper recirculation fan and filters are adjacent to door 3 above the center overhead bins.
The fans attach to the outlet of a filter plenum assembly and to an overhead passenger cabin conditioned air distribution duct.
The filters are attached inside the filter plenum assembly.
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AIR CONDITIONING -RECIRCULATION -UPPER RECIRCULATION FANS AND FILTERS
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