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A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - SYSTEM OPERATION
A330/A340 FLEET DSC-21-20-30 P 7/10
FCOM 19 AUG 10
PRESSURIZATION MODES SWITCHING
Applicable to: ,
MAXIMUM DIFFERENTIAL PRESSURE LIMITER FUNCTION
Applicable to:
This function is only available in automatic mode. If the differential pressure is above 8.70 PSI, the
CPC maintains the ▵p constant, to avoid over-pressurization. As a result, the outflow valves open
and the CAB V/S increases. Once the differential pressure has decreased below the threshold,
normal automatic control of the valves resumes ; this generally causes the valves to go towards the
closed position.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - SYSTEM OPERATION
A330/A340 FLEET DSC-21-20-30 P 8/10
FCOM 19 AUG 10
CAUTION Except for the outflow valve position indication and the ▵p value on the ECAM
PRESS page, there is no indication in the cockpit that the limiter function is activated.
Once the ▵p limiter function has opened the valves, do not counteract the automatic
operation by trying to close the valves in manual mode.
Due to the slow movement of the outflow valves in manual mode, the valves cannot
be closed fast enough and the cabin altitude quickly increases above 20 000 ft (even
if an emergency descent is initiated simultaneously). The automatic mode provides
the safest and the quickest way to reduce differential pressure, and recover normal
pressure control.
MAXIMUM DIFFERENTIAL PRESSURE LIMITER FUNCTION
Applicable to: ,
This function is only available in automatic mode. If the differential pressure is above 8.42 PSI, the
CPC maintains the ▵p constant, to avoid over-pressurization. As a result, the outflow valves open
and the CAB V/S increases. Once the differential pressure has decreased below the threshold,
normal automatic control of the valves resumes ; this generally causes the valves to go towards the
closed position.
CAUTION Except for the outflow valve position indication and the ▵p value on the ECAM
PRESS page, there is no indication in the cockpit that the limiter function is activated.
Once the ▵p limiter function has opened the valves, do not counteract the automatic
operation by trying to close the valves in manual mode.
Due to the slow movement of the outflow valves in manual mode, the valves cannot
be closed fast enough and the cabin altitude quickly increases above 20 000 ft (even
if an emergency descent is initiated simultaneously). The automatic mode provides
the safest and the quickest way to reduce differential pressure, and recover normal
pressure control.
MANUAL PRESSURE CONTROL MODE
Applicable to: ALL
If both automatic systems fail, the flight crew may use the CABIN PRESS control panel to take over
manual control of cabin pressurization.
• Press the MODE SEL pushbutton to select MAN, and
• Push the MAN V/S CTL toggle switch UP or DN to increase or decrease cabin altitude.
Depending on the VALVE SEL position, the flight crew manually controls both, or only one, outflow
valve(s).
If only one outflow valve is selected, the other one remains under automatic control.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - SYSTEM OPERATION
A330/A340 FLEET DSC-21-20-30 P 9/10
FCOM 19 AUG 10
Note: 1. Due to the slow operation of the outflow valves in manual mode, and the limited
resolution of the outflow valves’ position on the ECAM, the visual ECAM indication of a
change in the outflow valves’ position can take up to 5 s.
2. As the pressurization system is manually-controlled, the outflow valves do not
automatically open at touchdown.
DITCHING
Applicable to:
To prepare for ditching, the flight crew must press the DITCHING pushbutton on the CABIN PRESS
control panel to close the outflow valves, the emergency ram air inlet, the avionics ventilation inlet
and extract valves, and the pack flow control valves.
DITCHING
Applicable to: ,
To prepare for ditching, the flight crew must press the DITCHING pushbutton on the CABIN PRESS
control panel to close the outflow valves, the emergency ram air inlet, the avionics ventilation
overboard valve, and the pack flow control valves.
PREVENTION OF PRESSURIZATION WITH A DOOR NOT CLOSED AND LOCKED
Applicable to: ALL
On ground, at takeoff power application, if at least one door is not closed and locked, the CPC will
remain in ground mode (outflow valves open).
Note: As a backup, the zone controller closes the pack valves (Refer to DSC-21-10-30 ZONE
　
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