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OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - MAIN COMPONENTS
A330/A340 FLEET DSC-21-20-20 P 1/4
FCOM 19 AUG 10
CABIN PRESSURE CONTROLLERS
Applicable to:
Two identical, independent, automatic digital controllers control the system, and automatically
maintain 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),
the Landing Gear Control Interface Unit (LGCIU), the Proximity Switch Control Unit (PSCU) and the
pack flow control valves.
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.
CABIN PRESSURE CONTROLLERS
Applicable to: ,
Two identical, independent, automatic controllers are used for cabin pressure control. They receive
signals from the Air Data Inertial Reference System (ADIRS), the Flight Management and Guidance
Computer (FMGC), the Engine Interface Unit (EIU), the Landing Gear Control Interface Unit (LGCIU),
the Proximity Switch Control Unit (PSCU) and the pack flow control valves. They perform the
automatic cabin pressure control. They generate signals for the ECAM. In automatic mode, one
controller is active, the other is on standby.
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 VALVES
Applicable to:
The outflow valves are located below the flotation line. Each 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 two automatic motors, and the drive of 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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - MAIN COMPONENTS
A330/A340 FLEET DSC-21-20-20 P 2/4
FCOM 19 AUG 10
In manual mode, the backup section of the N° 1 controller signals the position of the valve to the
ECAM.
The outflow valves automatically close, if the cabin altitude reaches 15 000 ft, provided that the
valves are in automatic mode.
When one pack is OFF and ▵P is above 4 PSI, the aft outflow valve closes and the forward outflow
valve controls the cabin pressure.
Note: When the RAM AIR pushbutton is ON, and ▵P is below 1 PSI, the system drives the outflow
valves about 50 % open if it is under automatic control. If the system is under manual
control, the outflow valves do not automatically open, even if ▵P is below 1 PSI.
OUTFLOW VALVES
Applicable to: ,
Two outflow valves are located below the flotation line. Each 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 two electric motors, and the drive of a third electric
motor. Either of two electric motors operates the valve in automatic mode, and a third electric motor
operates it in manual mode. To allow an easy and smooth control of the cabin’s vertical speed in
manual mode, the outflow valves move at a speed which is about 1/5 of that in automatic 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.
The outflow valves automatically close, if the cabin altitude reaches 15 000 ft, provided that the
valves are in automatic mode.
When one pack is OFF and ▵P is above 4 PSI, the aft outflow valve closes and the forward outflow
valve controls the cabin pressure.
Note: When the RAM AIR pushbutton is ON, and ▵P is below 1 PSI, the system drives the outflow
　
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