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AIR CONDITIONING - PRESSURIZATION CONTROL - CABIN ALT WARNING SWITCH - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 21-30-00
Page 73
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The heating system supplies warm air to areas to prevent
freezing or to increase temperature for comfort.
General
These are the parts of the heating system:
* Forward cargo compartment heating
* Supplemental heating
* Aft cargo compartment heating.
Cargo Compartments
The cargo compartments receive heat from equipment cooling
exhaust and passenger compartment air.
Warm equipment cooling exhaust air flows under the forward
cargo compartment floor and along the sidewalls. The air mixes
with passenger compartment air in the main distribution
manifold.
The aft cargo compartment air comes from the passenger
compartment through the foot level grilles. The air goes into the
sidewall area around and under the aft cargo compartment
through the outflow valve.
The warm air on all sides of the cargo compartments is an
insulator. It prevents the transfer of heat through the skin by
conduction.
Supplemental Heating
In the passenger compartment, door area heaters supply more
heat around the two main entry doors. Also, heater blankets
supply more heat around the emergency escape doors.
AIR CONDITIONING - HEATING - INTRODUCTION
EFFECTIVITY
GUN ALL 21-40-00
Page 2
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-40-00-001
AIR CONDITIONING - HEATING - INTRODUCTION
AIR CONDITIONING - HEATING - INTRODUCTION
EFFECTIVITY
GUN 001-099, 201-999 21-40-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-40-00-001
AIR CONDITIONING - HEATING - INTRODUCTION
AIR CONDITIONING - HEATING - INTRODUCTION
EFFECTIVITY
GUN 101-118 21-40-00
Page 4
D633A101-GUN Oct 10/2006
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-40-00-001
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AIR CONDITIONING - HEATING - INTRODUCTION
21-45-00
Page 1
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The door area heaters supply added heat to prevent cold zones
around the doors.
Location
The forward door area heater is on the left outboard side of the
nose wheel well. Remove the aft left access panel from inside
the nose wheel well to get access to the heater.
The aft door area heater is in the center ceiling area in the aft
passenger compartment.
Physical Description
The door area heaters are electrical heat elements in a
cylindrical housing. There is an electrical connector on the
housing. Flexible hoses connect conditioned air distribution
supply ducts to the door area heaters. A flexible hose connects
the outlet side of the heater to a fitting at the base of the door.
The forward door heater uses conditioned air from the flight
compartment distribution supply.
The aft door heater uses conditioned air from the aft passenger
compartment distribution supply ducts.
AIR CONDITIONING - SUPPLEMENTAL HEATING - DOOR AREA HEATER
EFFECTIVITY
GUN ALL 21-45-00
Page 2
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-45-00-001
AIR CONDITIONING - SUPPLEMENTAL HEATING - DOOR AREA HEATER
AIR CONDITIONING - SUPPLEMENTAL HEATING - DOOR AREA HEATER
EFFECTIVITY
GUN 001-099, 101-118 21-45-00
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
21-45-00-001
AIR CONDITIONING - SUPPLEMENTAL HEATING - DOOR AREA HEATER
AIR CONDITIONING - SUPPLEMENTAL HEATING - DOOR AREA HEATER
EFFECTIVITY
GUN 201-999 21-45-00
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D633A101-GUN Oct 10/2005
　
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