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OPERATING MANUAL
AIRCRAFT SYSTEMS
OXYGEN
FIXED OXYGEN SYSTEM FOR CABIN - DESCRIPTION
A330/A340 FLEET DSC-35-30-10 P 2/8
FCOM 19 AUG 10
OPERATION
Applicable to:
Normally, the system is unpressurized. A pneumatically-controlled bleed ventilation valve releases
any residual pressure. Each container has a pneumatical latching mechanism that automatically
opens to allow the masks to drop, if the cabin pressure altitude exceeds 14 000 ft (+ 0, – 500 ft).
Flight crew members can override the automatic control.
When the masks are released, the passenger address system automatically broadcasts prerecorded
instructions for their use.
Oxygen supply begins when the passenger pulls the mask towards the passenger seat. The mask
receives pure oxygen, under positive pressure, at a rate governed by the cabin pressure altitude and
a flow regulating device in each container. The length of time that the oxygen supply will last, after
the cabin suffers decompression, depends on the number of cylinders installed, the number of masks
in use, and the flight attitude profile flown.
At a cabin pressure altitude of less than 10 000 ft, there will be no oxygen flow.
A reset is available for the rearming of the system, when the cabin altitude is below 10 000 ft, and the
masks have been returned to their containers.
A manual release tool allows the crew to deploy the masks, if the pneumatic door latch release fails.
It is stored at the cabin attendants’ station.
Note: If the oxygen system supply lines sustain damage from an engine burst, the supply to cabin
oxygen system could be partially lost, without any indication of the loss appearing in the
cockpit.
OPERATION
Applicable to: ,
Each container has a electrical latching mechanism that automatically opens to allow the masks to
drop, if the cabin pressure altitude exceeds 14 000 ft (+ 0, – 500 ft).
Flight crew members can override the automatic control.
When the masks are released, the passenger address system automatically broadcasts prerecorded
instructions (if installed) for their use.
Oxygen supply begins when the passenger pulls the mask towards the passenger seat. The
chemical reaction used for oxygen generation creates heat. Therefore, a smell of burning, smoke
and an increase in cabin temperature may be associated with the normal operation of the oxygen
generators. The mask receives pure oxygen under positive pressure for about 15 min, until the
generator is exhausted.
A reset is available for the rearming of the system after the masks are restowed.
A manual release tool allows the crew to open the doors manually, in case of electrical failure.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
OXYGEN
FIXED OXYGEN SYSTEM FOR CABIN - DESCRIPTION
A330/A340 FLEET DSC-35-30-10 P 3/8
FCOM 19 AUG 10
OPERATION
Applicable to:
Normally, the system is unpressurized. A pneumatically-controlled bleed ventilation valve releases
any residual pressure. Each container has a pneumatical latching mechanism that automatically
opens to allow the masks to drop, if the cabin pressure altitude exceeds 14 000 ft (+0, – 500 ft) the
system pressurizes, the masks drop and (if installed) prerecorded instructions sound automatically
via the passenger address system. The flight crew may operate the system manually.
Oxygen supply begins when the passenger pulls the mask towards the passenger seat. The mask
receives pure oxygen, under positive pressure, at a rate governed by the cabin pressure altitude and
a flow regulating device in each container. The length of time that the oxygen supply will last, after
the cabin suffers decompression, depends on the number of cylinders installed, the number of masks
in use, and the flight attitude profile flown.
At a cabin pressure altitude of less than 10 000 ft, there will be no oxygen flow.
A reset is available for the rearming of the system, when the cabin altitude is below 14 000 ft, and the
masks have been returned to their containers.
A manual release tool allows the crew to deploy the masks, if the pneumatic door latch release fails.
It is stored at the cabin attendants’ station.
Note: If the oxygen system supply lines sustain damage from an engine burst, the supply to cabin
oxygen system could be partially lost, without any indication of the loss appearing in the
cockpit.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
OXYGEN
FIXED OXYGEN SYSTEM FOR CABIN - DESCRIPTION
A330/A340 FLEET DSC-35-30-10 P 4/8
FCOM 19 AUG 10
SCHEMATIC
Applicable to: ,
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
　
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