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AIR CONDITIONING - PRESSURIZATION CONTROL - AUTO MODE - 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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
21-30-00-110
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AIR CONDITIONING - PRESSURIZATION CONTROL - AUTO MODE - FUNCTIONAL DESCRIPTION
21-30-00
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D633A101-GUN Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The amber AUTO FAIL light gives the flight crew indication that
one or both auto channels are inoperative.
General Description
The automatic pressurization control system has a dual
redundant architecture. One digital cabin pressure controller
(CPC) is active and maintains pressurization control. The other
CPC is a backup.
If the active CPC controller fails, the system changes
pressurization control to the backup (alternate) CPC.
The two CPCs automatically do start-up and continuous BITE
tests. These tests look at both systems to the LRU level. When
the active CPC BITE detects a fault or failure, it transfers active
control to the backup CPC.
These things cause the auto fail function:
* Power loss
* Cabin altitude rate of change is too high (>2,000 slfpm)
* Cabin altitude is too high (>15,800 ft)
* Wiring failures
* Outflow valve component failures
* CPC failures
* Cabin differential pressure is too high (>8.75 psi).
Single Channel Failure
The system automatically changes pressurization control to the
backup controller if the active controller fails.
If the system is in the AUTO mode when an auto fail event
occurs, these lights come on:
* Amber AUTO FAIL light
* MASTER CAUTION and AIR COND annunciator lights
* Green ALTN light.
The ALTN light shows that the backup system is active. The
AUTO FAIL light goes off when you select the ALTN position on
the mode selector.
Dual Channel Failure
These are the indications when both CPC systems fail:
* The AUTO FAIL and MASTER CAUTION lights come on
* The FLT ALT and LAND ALT displays show five dashes (-----).
If both CPCs fail, the ALTN light does not come on. This
indicates that the system cannot transfer control to an operative
automatic controller.
Training Information Point
This table shows you how to find the status of the automatic
system by the indication lights and the select switch position.
AIR CONDITIONING - PRESSURIZATION CONTROL - AUTO FAIL
EFFECTIVITY
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Page 47
D633A101-GUN Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-30-00-112
MODE SELECT
SWITCH
AUTO FAIL LIGHT ALTN LIGHT STATUS/
FAILURES
AUTO OFF OFF FULL UP SYSTEM/
NONE
AUTO ON ON ONE AUTO FAIL
AUTO ON OFF DUAL AUTO FAIL
ALTN OFF ON ONE AUTO FAIL
ALTN ON OFF DUAL AUTO FAIL
AIR CONDITIONING - PRESSURIZATION CONTROL - AUTO FAIL
EFFECTIVITY
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Page 48
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-30-00-112
AIR CONDITIONING - PRESSURIZATION CONTROL - AUTO FAIL
AIR CONDITIONING - PRESSURIZATION CONTROL - AUTO FAIL
EFFECTIVITY
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D633A101-GUN Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-30-00-112
General
The cabin pressure control system has these indications:
* AUTO FAIL
* OFF SCHED DESCENT
* ALTN
* MANUAL.
AUTO FAIL Light
The AUTO FAIL light is usually controlled by the cabin pressure
control module. If the cabin pressure control module fails, the
AUTO FAIL light is controlled by relays R556, R557, and R558.
OFF SCHED DESCENT Light
The OFF SCHED DESCENT light is controlled by these units:
* CPC 1
* CPC 2.
The CPC turns on the OFF SCHED DESCENT light when an off
schedule descent is detected by a CPC.
ALTN Light
The ALTN light is controlled by the cabin pressure control
module.
The cabin pressure control module turns on the ALTN light
when the backup CPC is active.
MANUAL Light
The MANUAL light is controlled by the cabin pressure control
module.
The CPCs are deactivated and the MANUAL light comes on
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