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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.
SAFETY VALVES
Applicable to:
Two independent pneumatic safety valves prevent the cabin pressure from going too high (8.85 PSI
above external ambient pressure) or too low (1 PSI below external ambient pressure). They are on
the rear pressure bulkhead, above the flotation line.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - MAIN COMPONENTS
A330/A340 FLEET DSC-21-20-20 P 3/4
FCOM 19 AUG 10
SAFETY VALVES
Applicable to: ,
Three independent pneumatic safety valves prevent the cabin pressure from going too high (8.85 PSI
above external ambient pressure) or too low (0.73 PSI below external ambient pressure). They are
on the rear pressure bulkhead, above the flotation line.
NEGATIVE RELIEF VALVE
Applicable to: ALL
It is below the floor level, aft of left door n° 1, above the floatation line.
It assists the safety valves to prevent the cabin pressure from going too low.
RESIDUAL PRESSURE CONTROL UNIT (RPCU)
Applicable to: ,
The Residual Pressure Control Unit (RPCU) automatically depressurizes the aircraft in case of
abnormal residual pressure on ground. It automatically opens the outflow valve, when:
The outflow valve is not fully open, and‐
Both CPCs are failed, or manual mode is selected, and‐
The aircraft is on ground, and‐
All engines are shutdown, or all ADIRS indicate an airspeed below 100 kt.‐
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - MAIN COMPONENTS
A330/A340 FLEET DSC-21-20-20 P 4/4
FCOM 19 AUG 10
PRESSURIZATION FLIGHT PROFILE
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - SYSTEM OPERATION
A330/A340 FLEET DSC-21-20-30 P 1/10
FCOM 19 AUG 10
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.
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.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - SYSTEM OPERATION
A330/A340 FLEET DSC-21-20-30 P 2/10
FCOM 19 AUG 10
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 a maximum of 7 350 ft.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AIR COND / PRESS / VENT
PRESSURIZATION - SYSTEM OPERATION
　
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