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A330/A340 FLEET DSC-21-20-30 P 3/10
FCOM 19 AUG 10
DESCENT IN INTERNAL MODE (DI)
Pressure rate is optimized so that cabin pressure reaches landing field pressure +0.1 PSI just
prior to landing. The cabin descent rate is limited to 750 ft/min.
DESCENT IN EXTERNAL MODE (DE)
CAB altitude varies according to FMGS-estimated times, and cabin pressure reaches landing
field pressure +0.1 PSI just prior to landing.
The cabin descent rate is limited to 750 ft/min.
ABORT (AB)
The abort mode prevents the cabin altitude from climbing, if the aircraft does not climb after
takeoff.
Cabin pressure is set back to the takeoff altitude +0.1 PSI.
AUTOMATIC PRESSURE CONTROL MODE
Applicable to: ,
GENERAL
Two identical, independent, automatic systems (each consisting of a controller and its‐
associated motors) control cabin pressure.
Either system controls the two outflow valves.
Only one controller operates at a time.
An automatic transfer occurs :
• 80 s after each landing.
• If the operating system fails.
The controller normally uses the landing elevation and the QNH from the FMGC, and the‐
pressure altitude from the ADIRS.
If FMGC data are unavailable, the controller uses the Captain Baro Reference from the ADIRS
and the LDG ELEV selection.
Pressurization is assumed through the following modes:‐
GROUND (GND)
Before takeoff, and 80 s after landing, the system keeps the outflow valves fully open to ensure
there is no residual pressure differential in the aircraft.
At touchdown, to release the remaining cabin overpressure, a depressurization sequence
controls the cabin V/S at + 500 ft/min.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - SYSTEM OPERATION
A330/A340 FLEET DSC-21-20-30 P 4/10
FCOM 19 AUG 10
TAKEOFF (TO)
To avoid a pressure surge at rotation, the controller prepressurizes the aircraft at a rate of -
328 ft/min until the pressure differential reaches 0.1 PSI. At lift off, the controller initiates the
climb phase.
CLIMB IN INTERNAL MODE (CI)
CAB V/S varies, according to a preprogrammed law, in order to reach the scheduled CAB ALT
at the top of climb defined by the FMGS cruise FL.
The CAB V/S is limited to 1 000 ft/min.
The LDG ELEV selector has no effect in climb.
If FMGS cruise FL is not valid, the default FL 410 is used.
CLIMB IN EXTERNAL MODE (CE)
CAB ALT varies according to FMGS estimated times and planned cruise FL.
The cabin climb rate is limited to 1 000 ft/min.
CRUISE (CRZ)
When the CPC switches to CRZ mode, the cabin altitude is controlled to the lower of cabin
altitude reached at the top of climb, or the scheduled CAB ALT for the actual cruise flight level. If
the cabin altitude at the top of climb is higher (no FMGS CR FL available), it will descend with a
rate of 300 ft/min to the scheduled CAB ALT.
If a LDG ELEV above the actual CAB ALT is selected (manual or FMGS), the cabin altitude
increases up to the higher of CAB ALT, at the top of climb, or to the LDG ELEV minus 6 000 ft).
The cabin altitude is limited to 7 350 ft for flights longer than 2.5 h, and 8 000 ft for flights shorter
than 2.5 h.
Note: If the takeoff runway is higher than 8 000 ft, the cabin altitude remains at takeoff
altitude until cruise.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - SYSTEM OPERATION
A330/A340 FLEET DSC-21-20-30 P 5/10
FCOM 19 AUG 10
DESCENT IN INTERNAL MODE (DI)
Pressure rate is optimized so that cabin pressure reaches landing field pressure +0.1 PSI just
prior to landing. The cabin descent rate is limited to 750 ft/min.
DESCENT IN EXTERNAL MODE (DE)
CAB altitude varies according to FMGS-estimated times, and cabin pressure reaches landing
field pressure +0.1 PSI just prior to landing.
The cabin descent rate is limited to 750 ft/min.
ABORT (AB)
The abort mode prevents the cabin altitude from climbing, if the aircraft does not climb after
takeoff.
Cabin pressure is set back to the takeoff altitude +0.1 PSI.
GROUND (AFTER LANDING) (GND)
At touchdown, to release the remaining ▵P a depressurized sequence controls the cabin vertical
speed at + 500 ft/min.
80 s after landing the outflow valves are controlled fully open to ensure there is no residual ▵P in
the aircraft.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - SYSTEM OPERATION
A330/A340 FLEET DSC-21-20-30 P 6/10
FCOM 19 AUG 10
PRESSURIZATION MODES SWITCHING
Applicable to:
　
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