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* Supplies cooling air to electronic equipment.
AIR CONDITIONING - DISTRIBUTION - INTRODUCTION
EFFECTIVITY
GUN 101-118 21-20-00
Page 2
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-20-00-001
AIR CONDITIONING - DISTRIBUTION - INTRODUCTION
AIR CONDITIONING - DISTRIBUTION - INTRODUCTION
EFFECTIVITY
GUN 101-118 21-20-00
Page 3
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-20-00-001
General description
The distribution system has these sub-systems:
* Main air distribution
* Flight compartment conditioned air distribution
* Passenger cabin conditioned air distribution
* Recirculation system
* Ventilation system
* Equipment cooling system.
Main Air Distribution
The main air distribution system gets air from these sources:
* Air conditioning packs
* Ground conditioned air
* Recirculation system.
The main distribution manifold collects and mixes air from any
combination of the sources.
Flight Compartment Conditioned Air Distribution
The flight compartment gets conditioned air from the left pack
and the mix manifold. The air goes through a duct on the left
side of the airplane. The flight compartment has supply ducts
and outlets to control the air flow at each station.
Passenger Compartment Conditioned Air Distribution
The passenger conditioned air distribution gets air from the mix
manifold. The air goes through riser ducts and up side walls to
an overhead distribution duct. Outlets along the side walls and
the center of the ceiling divide the air for symmetrical supply.
Recirculation System
The recirculation system uses a fan to move air from the
passenger compartment to the main distribution manifold. This
system reduces the amount of air necessary for the packs to
supply.
Ventilation
The ventilation system uses differential pressure to pull air out
of the airplane. The air moves through overboard vents from the
cabin galley and the lavatory areas.
Equipment Cooling System
The equipment cooling system removes heat from the
equipment in the main equipment center and the flight
compartment.
AIR CONDITIONING - DISTRIBUTION - GENERAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-20-00
Page 4
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-20-00-002
AIR CONDITIONING - DISTRIBUTION - GENERAL DESCRIPTION
AIR CONDITIONING - DISTRIBUTION - GENERAL DESCRIPTION
EFFECTIVITY
GUN 101-118 21-20-00
Page 5
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-20-00-002
General
The controls for the air conditioning distribution system are on
the air conditioning/bleed air controls panel, P5-10, in the flight
compartment.
Recirculation System
The recirculation fan is enabled when you move the recirc fan
switch to the AUTO position. Recirculation fan operation is
dependent on air conditioning pack operation.
AIR CONDITIONING - DISTRIBUTION - OPERATION
EFFECTIVITY
GUN 101-118 21-20-00
Page 6
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-20-00-003
AIR CONDITIONING - DISTRIBUTION - OPERATION
AIR CONDITIONING - DISTRIBUTION - OPERATION
EFFECTIVITY
GUN 101-118 21-20-00
Page 7
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-20-00-003
Purpose
The distribution system has these functions:
* Divides conditioned air to the three airplane zones
* Reduces engine bleed requirements
* Removes offensive air from lavatories and galleys
* Supplies cooling air to electronic equipment.
Main Air Distribution
The main air distribution components send conditioned air to
these zones:
* Flight compartment
* Forward passenger compartment
* Aft passenger compartment.
Conditioned air comes from these sources:
* Ground supplied conditioned air
* Air conditioning packs
* Recirculation system.
Flight Compartment Distribution
The flight compartment has an independent source of
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