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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-30-00-130
Purpose
The aft outflow valve controls the air flow out of the airplane
fuselage.
Location
The valve is on the lower right fuselage below the aft service
door.
Physical Description
The outflow valve has these parts:
* Two valve gates
* Actuator assembly and linkage
* Position transducer
* Two automatic mode motors and one manual mode motor
* Two electronic actuators.
Functional Description
The valve is a thrust recovery, double gate type valve. The
valve has two 28v dc motors and one 48v dc motor. Only one
motor drives the valve at a time. All three motors use the same
actuator mechanism.
Each electronic actuator on the valve has a fail-safe aneroid
switch. The switch causes the valve to go fully closed if the
cabin pressure altitude gets to 14,500 ft. This function overrides
normal automatic control only. It does not override manual
mode of the valve.
A position transducer on the valve assembly provides a signal
to the valve position indicator on the P5 forward overhead panel
during all modes of operation.
The valve position transducer also sends signals to the two
cabin pressure controllers. This gives the controllers valve
position feedback for automatic and alternate modes of
operation.
Training Information Point
The valve mount lug fittings let you remove and install the
assembly from outside the airplane.
AIR CONDITIONING - PRESSURIZATION CONTROL - AFT OUTFLOW VALVE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-30-00-108
AIR CONDITIONING - PRESSURIZATION CONTROL - AFT OUTFLOW VALVE
AIR CONDITIONING - PRESSURIZATION CONTROL - AFT OUTFLOW VALVE
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-30-00-108
Purpose
The automatic (AUTO) mode of the pressurization control
system keeps the airplane pressurized for all phases of the
flight.
Functional Description
The AUTO mode circuitry has these parts:
* Redundant 28v dc power sources
* Cabin pressure control module on P5
* Two digital cabin pressure controllers (CPCs)
* Two AUTO mode dc motors with electronic actuators on the
aft outflow valve assembly
* Circuit wiring and connectors.
When the pressurization mode selector on the cabin pressure
control module is in the AUTO position, it sets the
pressurization control system to automatic operation.
The automatic control system has a dual redundant
architecture. The two CPCs are identical. Rack pin
connections identify the controllers as CPC 1 and CPC 2.
Only one CPC controls the outflow valve at any time. The other
CPC is a backup. The system changes active control from one
CPC to the other with each flight. This keeps wear equal on the
mechanical drive components of the two systems.
The CPCs use data from these systems to determine flight
phase:
* Both air data inertial reference units (ADIRUs)
* Both stall management and yaw damper computers
(SMYDCs)
* Proximity switch electronics unit (PSEU).
The CPC calculates a target cabin pressure in response to the
flight phase and inputs from the cabin pressure control panel.
The CPC compares the target pressure to the pressure at its
sense port. If there is a difference, the CPC sends an open or
close command to the electronic actuator on the aft outflow
valve assembly. The electronic actuator operates its valve
motor. The motor moves the outflow valve through a
mechanical drive train. The active controller modulates the aft
outflow valve to control cabin pressure and rate of pressure
change.
Outflow valve position feedback to the CPC verifies proper valve
operation (closed loop feedback).
The air conditioning pack valves and the overboard exhaust
valve give position feedback to the CPCs.
Both controllers run continuous BITE tests. If the active CPC
becomes inoperative, the other CPC automatically takes
control.
AIR CONDITIONING - PRESSURIZATION CONTROL - AUTO MODE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 21-30-00
Page 44
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
21-30-00-110
AIR CONDITIONING - PRESSURIZATION CONTROL - AUTO MODE - FUNCTIONAL DESCRIPTION
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