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passenger compartment failures:
* Cabin temperature sensor
* Cabin temperature sensor interface
* Duct temperature sensor
* Duct temperature sensor interface
* Cabin temperature selector
* Cabin temperature selector interface
* Zone trim air modulating valve
* Zone trim air modulating valve driver.
The backup passenger compartment FAULT switch is set by
these backup passenger compartment failures:
* Cabin temperature sensor
* Cabin temperature selector
* Other controller backup error signal output
* Standby pack-cabin loop electronics.
AIR CONDITIONING - TEMPERATURE CONTROL - ZONE TEMP INDICATION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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21-60-00-809
AIR CONDITIONING - TEMPERATURE CONTROL - ZONE TEMP INDICATION - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - TEMPERATURE CONTROL - ZONE TEMP INDICATION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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AIR CONDITIONING - TEMPERATURE CONTROL - ZONE TEMP INDICATION - FUNCTIONAL DESCRIPTION
21-60-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The pack light turns on for over temperature conditions, and
failures of the air conditioning temperature control system.
Power Interruption
Power interruption indication is given by power interrupt
indication relays.
If a power interruption is sensed, the PACK light on the P5 panel
comes on. The pack temperature control system is reset after
power has been restored.
Over Temperature Indication
Over temperature protection for the cooling pack is supplied by
these three thermal switches:
* Turbine inlet overheat (210F/99C)
* Pack discharge overheat (250F/121C)
* Compressor discharge overheat (390F/198C).
If an overheat condition is sensed, the PACK light on the P5
panel comes on. Push the TRIP RESET switch on the P5 panel
after the cooling pack has cooled to reset the pack temperature
control system.
Air Conditioning Packs Temperature Control System Failure
indication
A single failure of the pack control system causes the PACK
light to come on only when the master caution system is
recalled. This shows a BITE check of the controllers is
necessary.
If a complete loss of temperature control for the pack control
system occurs, the PACK light comes on and cannot be reset.
The standby pack FAULT switch is set by these standby pack
component failures:
* Pack temperature sensor
* Temperature control valve
* Pack control.
The pack INOP and pack FAULT switch is set by these pack
component failures:
* Pack temperature sensor or interface
* Temperature control valve or driver
* Pack control.
The pack FAULT switch is set by these pack component failures:
* Mix manifold temperature sensor or interface
* Mix manifold temperature sensor or interface from opposite
controller
AIR CONDITIONING - TEMPERATURE CONTROL - PACK LIGHT INDICATION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-810
* Zone duct demand signal or interface from opposite
controller
* Partial pack demand signal or interface from opposite
controller
* Ram air temperature sensor or interface
* Ram air door actuator or interface.
AIR CONDITIONING - TEMPERATURE CONTROL - PACK LIGHT INDICATION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
Page 90
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-60-00-810
AIR CONDITIONING - TEMPERATURE CONTROL - PACK LIGHT INDICATION - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - TEMPERATURE CONTROL - PACK LIGHT INDICATION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-60-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
　
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