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distribution systems. (SECTION 21-20)
AIR CONDITIONING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 201-999 21-00-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
21-00-00-804
AIR CONDITIONING - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-099 21-00-00
Page 27
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-00-00-804
AIR CONDITIONING - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 201-999 21-00-00
Page 28
D633A101-GUN Oct 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-00-00-804
Purpose
The pack/zone temperature controllers have front face BITE
that isolates system faults to the LRU interface level.
General Description
The BITE circuitry can detect failures of these components:
* Pack/Zone controller
* Ram air controller
* Pack standby controller
* Zone temperature selector
* Cabin temperature sensor
* Duct temperature sensor
* Zone trim air modulating valves
* Ram air control temperature sensor
* Ram air inlet actuator
* Standby pack temperature sensor
* Standby pack temperature control valve (TCV)
* Mix manifold temperature sensor
* Pack temperature sensor
* Pack temperature control valve (TCV).
The pack/zone temperature controller has one register for last
flight memory storage.
The pack/zone temperature controller has nine registers for
previous flight history memory storage.
BITE Test Switches
The pack/zone temperature controller has these switches:
* PRESS/TEST
* BIT
* PREV FLT
* VERIFY
* RESET.
The PRESS/TEST switch does a test of the 25 indicator lamps.
This monitors power and indication availability.
The BIT test switch starts a system self-test. The BIT switch
shows failures that occurred during the last flight.
A flight starts when the air mode is sensed for longer than 30
seconds.
The PREV FLT test switch starts a system self-test. The PREV
FLT switch shows all the failures that occurred during the last
nine flights.
The VERIFY test switch starts a system self-test.
AIR CONDITIONING - PACK/ZONE TEMPERATURE CONTROLLER - BITE
EFFECTIVITY
GUN 001-099, 201-999 21-00-00
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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
21-00-00-806
WARNING: MOVE ALL PERSONS AND EQUIPMENT AWAY
FROM THE RAM AIR INLET DOOR. WHEN YOU
PUSH THE VERIFY SWITCH, THE RAM AIR
COMPONENTS WILL MOVE AND CAN CAUSE
INJURY TO PERSONS OR DAMAGE TO
EQUIPMENT.
The VERFIY switch starts a real time test of the pack and zone
temperature control components.
The RESET test switch is used to erase the fault history. Push
the RESET switch while the VERFIY and the green GO lights are
on.
BITE Indications
The pack/zone temperature controller has a red lamp for each
of the LRUs.
The pack/zone temperature controller has a green lamp to
show no faults are in the system.
The pack/zone temperature controller has four amber lamps to
show the test in progress.
AIR CONDITIONING - PACK/ZONE TEMPERATURE CONTROLLER - BITE
EFFECTIVITY
GUN 001-099, 201-999 21-00-00
Page 30
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-00-00-806
AIR CONDITIONING - PACK/ZONE TEMPERATURE CONTROLLER - BITE
AIR CONDITIONING - PACK/ZONE TEMPERATURE CONTROLLER - BITE
EFFECTIVITY
GUN 001-099, 201-999 21-00-00
Page 31
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-00-00-806
THIS PAGE IS INTENTIONALLY LEFT BLANK
21-20-00
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 distribution system has these functions:
* Provides conditioned air to the two airplane zones
* Recirculates passenger cabin conditioned air
* Provides ventilation for lavatories and galleys
　
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