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time. The other CPC is a backup. The active controller changes
for every flight or when there is an autofail event.
The manual control mode overrides and bypasses the two
CPCs. The manual control system has its own valve motor
system. This gives the pressurization control system a triple
redundant architecture.
The cabin pressure control system has these components:
* Cabin pressure control module
* Digital cabin pressure controllers (2)
* Aft outflow valve assembly with three drive motors
* Wiring, connectors, and power sources.
Electric Power
The system gets 28v dc power from these sources:
* Battery bus
* DC bus 1
* DC bus 2.
Data Input Interface
The flight crew makes these inputs to the cabin pressure control
module:
* Pressurization mode
* Flight altitude
* Landing altitude.
A sensor on each CPC senses pressure in the cabin.
Each CPC gets air data from both of the air data inertial
reference units (ADIRUs), engine speed data from both of the
stall management and yaw damper computers (SMYDCs), and
air/ground logic from the proximity switch electronics unit
(PSEU).
Each CPC uses position feedback from these valves that affect
the pressurization system:
* Left pack valve
* Right pack valve
* Overboard exhaust valve.
Outflow Valve Interface
The outflow valve has these three motors:
* Two AUTO motors with electronic actuators
* One MANUAL motor.
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The CPCs use data buses to interface with the electronic
actuators on the valve. The electronic actuators drive the auto
motors. Altitude switches in each electronic actuator override
CPC signals and close the outflow valve if the cabin altitude is
14,500 feet. This function does not affect the manual mode of
operation of the outflow valve.
In the manual mode, the pilot uses the control module toggle
switch to operate the outflow valve. The manual motor has no
electronic actuator, and no pressure switch.
The outflow valve gives position feedback to these units:
* Two CPCs
* P5 forward overhead panel.
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AIR CONDITIONING - PRESSURIZATION CONTROL - INTERFACE
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Purpose
The cabin pressure control module and the cabin altitude panel
let the crew monitor and control the pressurization system.
Location
The cabin pressure control module and cabin altitude panel are
on the P5 forward overhead panel.
Cabin Pressure Control Module
The cabin pressure control module has these controls and
indications:
* Mode selector
* LAND ALT (Landing altitude) selector with display
* FLT ALT (flight altitude) selector with display
* Manual mode toggle switch
* Aft outflow valve position indicator.
The mode selector has these positions:
* AUTO
* ALT - alternate automatic operation
* MAN - manual operation.
The FLT ALT selector sets cruise altitude from -1,000 to 42,000 ft
in increments of 500 feet.
The LAND ALT selector sets landing field altitude from -1,000 to
14,000 ft in increments of 50 feet.
The outflow valve switch is a three-position toggle switch,
spring-loaded to the neutral position. It controls the aft outflow
valve in the manual mode. These are the three positions of the
outflow valve switch:
* CLOSE
* Neutral
* OPEN.
An aft outflow valve position indicator shows the aft outflow
valve position in all modes of operation.
These are the four system status lights above the control panel:
* AUTO FAIL (system failure)
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