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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-45-00-001
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AIR CONDITIONING - SUPPLEMENTAL HEATING - DOOR AREA HEATER
21-45-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
Purpose
Additional heating is necessary in the emergency escape door
areas. Electric heater blankets provide this additional heating.
Location
The blankets are behind the decorative trim around each door.
Emergency Escape Door Heater Blankets
The emergency escape doors are heated with heater blankets
behind the lining, door trim, and close out panels.
There are two types of emergency escape door heater blankets:
* 10 watts (one heater blanket)
* 50 watts (four heater blankets).
The 10 watt close-out panel heater blanket is behind the lining
below the escape door. The 50 watt heater blankets are behind
the escape door lining and door trim.
AIR CONDITIONING - SUPPLEMENTAL HEATING - EMERGENCY ESCAPE DOOR - HEATER BLANKETS
EFFECTIVITY
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
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AIR CONDITIONING - SUPPLEMENTAL HEATING - EMERGENCY ESCAPE DOOR - HEATER BLANKETS
AIR CONDITIONING - SUPPLEMENTAL HEATING - EMERGENCY ESCAPE DOOR - HEATER BLANKETS
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-45-00-003
AIR CONDITIONING - SUPPLEMENTAL HEATING - EMERGENCY ESCAPE DOOR - HEATER BLANKETS
AIR CONDITIONING - SUPPLEMENTAL HEATING - EMERGENCY ESCAPE DOOR - HEATER BLANKETS
EFFECTIVITY
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
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AIR CONDITIONING - SUPPLEMENTAL HEATING - EMERGENCY ESCAPE DOOR - HEATER BLANKETS
21-45-00
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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
General
The air conditioning system controls operation of the door area
heaters.
The logic for the door area heaters comes from the air/ground
system and air conditioning pack valve operation.
Functional Description
The fwd and aft door area heater power relay (R560) controls
power to the area heaters. When the airplane is in the air and
one of the pack flow control and shutoff valves is open, the relay
energizes. When the relay energizes, 115v ac power from main
bus 1 goes to the heaters.
Door Area Heaters
The door area heaters use phase-to-phase power. Each heat
element uses 325 watts. There are internal temperature control
components that keep the temperature to a limit. The overheat
switch opens at 230F (110C) and closes at 200F (93C). The
thermal fuse opens at 300F (148C).
Overwing Emergency Exit Door Heaters
The overwing emergency exit doors are heated with heaters
behind the lining, door trim, and close out panels.
The close out panel heater uses 10 watts. An overheat switch
keeps the temperature to a limit. The overheat switch opens at
100F (38C) and closes at 80F (27C).
The door lining and trim heaters use 50 watts. There are
internal temperature control components that keep the
temperature to a limit. The temperature control switch opens
at 80F (27C) and closes at 70F (21C). The overheat switch opens
at 95F (35C) and closes at 50F (10C).
AIR CONDITIONING - SUPPLEMENTAL HEATING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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AIR CONDITIONING - SUPPLEMENTAL HEATING - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - SUPPLEMENTAL HEATING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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