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when the selector switch is in the MANUAL position.
AIR CONDITIONING - PRESSURIZATION CONTROL - INDICATION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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AIR CONDITIONING - PRESSURIZATION CONTROL - INDICATION - FUNCTIONAL DESCRIPTION
AIR CONDITIONING - PRESSURIZATION CONTROL - INDICATION - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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General Description
The off schedule descent feature works only in the AUTO and
ALTN modes. It is not a feature of the MANUAL mode.
If it is necessary to land immediately after takeoff, the
pressurization control system programs the pressurization
system for landing. The off schedule descent (OFF SCHED
DESCENT) indication is part of this feature. The light tells you
that the system will control cabin pressure for a return to the
take-off field.
An off schedule descent begins when the airplane starts to
descend off schedule (before it gets to cruise altitude).
Functional Description
If the airplane begins a descent before it gets to the FLT ALT
selected on the control module, these things happen:
* OFF SCHED DESCENT light comes on
* MASTER CAUTION and AIR COND annunciator lights come
on
* Pressurization control system schedules the cabin pressure
for return to the take-off field.
The OFF SCHED DESCENT light will go out if any one of these
conditions occur:
* Airplane begins to climb again
* FLT ALT is reset to the current altitude
* Pilot selects manual (MAN) mode
* Airplane lands.
If the flight crew diverts to a field other than the take-off field, the
flight crew must do these steps to reset the pressure controller:
* Reset the FLT ALT to the current altitude
* Set the landing altitude in the LND ALT window on the
control panel to the landing field elevation.
The pressure control system cancels the off schedule descent
feature for the flight when the airplane gets to the FLT ALT set
on the cabin pressure control module.
AIR CONDITIONING - PRESSURIZATION CONTROL - OFF SCHED DESCENT LIGHT
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-30-00-111
AIR CONDITIONING - PRESSURIZATION CONTROL - OFF SCHED DESCENT LIGHT
AIR CONDITIONING - PRESSURIZATION CONTROL - OFF SCHED DESCENT LIGHT
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The MANUAL mode gives the flight crew direct control of the
outflow valve.
General Description
The MANUAL mode has these parts:
* 28v dc bat bus power sources
* Cabin pressure control module
* MANUAL mode DC motor on the aft outflow valve assembly
* Circuit wiring and connectors.
When the mode selector is in the MANUAL position, these
things occur:
* Automatic control systems are disarmed
* Control module outflow valve switch arms
* Green MANUAL system indication light comes on.
The aft outflow valve switch is a three position toggle switch.
These are the three positions:
* CLOSE
* Neutral
* OPEN.
The switch is spring-loaded to the neutral position.
Signals from the outflow valve switch go to the manual motor on
the aft outflow valve assembly. When the switch is in the CLOSE
position, the motor closes the valve. When the switch is in the
OPEN position, the motor opens the valve.
The position transducer on the aft outflow valve assembly gives
valve position feedback to the outflow valve position indicator.
You can use these instruments and placards on the cabin
altitude panel for reference during manual operation of the
pressurization system:
* Cabin altitude and differential pressure indicator
* Cabin rate of climb indicator
* Pressure limitation placard
* Cabin/flight altitude conversion placard.
AIR CONDITIONING - PRESSURIZATION CONTROL - MANUAL MODE - GENERAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
　
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