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PRESSURIZATION - GENERAL
A318/A319/A320/A321 FLEET DSC-21-20-10 P 2/4
FCOM 19 AUG 10
‐ Pressurization in flight : Adjusts cabin altitude, and rate of change to provide passengers with a
comfortable flight.
‐ Depressurization : After touchdown, gradually releases residual cabin overpressure before the
ground function fully opens the outflow valve.
The system consists of :
‐ Two Cabin Pressure Controllers (CPC)
‐ One Residual Pressure Control Unit (RPCU)
‐ One outflow valve, with an actuator that incorporates three motors (two for automatic operation,
one for manual operation)
‐ One control panel
‐ Two safety valves
Any one of the three independent electric motors may power the outflow valve.
Normally, one of the two cabin pressure controllers operates the outflow valve by means of its
associated automatic motor.
In case of ditching, an override switch on the control panel allows the flight crew to close the outflow
valve and all valves below the flotation line.
The flight crew can set the system to operate automatically, semi-automatically, or manually.
In normal operation, cabin pressurization is fully automatic.
AUTOMATIC OPERATION
Applicable to: ALL
The flight crew monitors the operation of the system, but does nothing to control it. Air pressure in
the cabin follows external schedules that the system receives as signals from the Flight Management
and Guidance System (FMGS).
When FMGS data is not available for automatic pressurization, the crew only needs to select the
landing field elevation.
The pressurization system then uses the manually-selected landing field elevation for internal
schedules.
MANUAL OPERATION
Applicable to: ALL
In manual mode, the flight crew controls the cabin altitude via the manual motor of the outflow valves,
by operating controls on the pressurization control panel.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
PRESSURIZATION - GENERAL
A318/A319/A320/A321 FLEET DSC-21-20-10 P 3/4
FCOM 19 AUG 10
SCHEMATICS
Applicable to: ALL
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
PRESSURIZATION - GENERAL
A318/A319/A320/A321 FLEET DSC-21-20-10 P 4/4
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR CONDITIONING / PRESSURIZATION / VENTILATION
PRESSURIZATION - MAIN COMPONENTS
A318/A319/A320/A321 FLEET DSC-21-20-20 P 1/2
FCOM 19 AUG 10
CABIN PRESSURE CONTROLLERS
Applicable to: ALL
Two identical, independent, digital controllers automatically control the system, by maintaining the
proper cabin pressure. They receive signals from the Air Data Inertial Reference System (ADIRS),
the Flight Management and Guidance Computer (FMGC), the Engine Interface Unit (EIU), and the
Landing Gear Control Interface Unit (LGCIU).
When the system is in automatic or semi-automatic mode, one controller is active, the other is on
standby.
The controllers also generate signals for the Electronic Centralized Aircraft Monitoring (ECAM).
For operation in manual mode, each controller has a backup section, which is powered by an
independent power supply in the controller N°1 position. This section also has a pressure sensor that
generates the cabin altitude and pressure signal for the ECAM, when MAN mode is selected.
The controllers communicate with each other via a cross-channel link.
OUTFLOW VALVE
Applicable to: ALL
The outflow valve is on the right-hand side of fuselage, behind the aft cargo compartment and below
the flotation line.
The outflow valve assembly consists of a flush, skin-mounted, rectangular frame, carrying inward and
outward opening flaps linked to the actuator. The actuator contains the drives of the two automatic
motors and the manual motor. Either of two automatic motors operates the valve in automatic mode,
and the manual motor operates it in manual mode.
In automatic mode, the operating controller signals the position of the valve to the ECAM.
In manual mode, the backup section of the N° 1 controller signals the position of the valve to the
ECAM.
Note: When the RAM AIR pushbutton is ON, and ▵p is below 1 PSI, the system drives the outflow
valve about 50 % open if it is under automatic control. If the system is under manual
control, the outflow valve does not automatically open, even if ▵p is below 1 PSI.
SAFETY VALVES
Applicable to: ALL
Two independent pneumatic safety valves prevent cabin pressure from going too high (8.6 PSI
　
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