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A mask-mounted regulator supplies a mixture of air and oxygen or pure oxygen, or performs
emergency pressure control. With the regulator set to NORMAL, the user breathes a mixture of cabin
air and oxygen up to the cabin altitude at which the regulator supplies 100 % oxygen. The user can
select 100 %, in which case the regulator supplies pure oxygen at all cabin altitudes.
If the situation calls for it, the user can use the emergency overpressure rotating knob and receive
pure oxygen at positive pressure.
The storage box contains a microphone lead, with a quick-disconnect, for connection to the
appropriate mask microphone cable.
Note: Each mask may have a removable film that protects the visor against scratches. This strip
is optional and may be removed from the mask at any time.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
OXYGEN
FIXED OXYGEN SYSTEM FOR COCKPIT - DESCRIPTION
A330/A340 FLEET DSC-35-20-10 P 5/8
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
OXYGEN
FIXED OXYGEN SYSTEM FOR COCKPIT - DESCRIPTION
A330/A340 FLEET DSC-35-20-10 P 6/8
FCOM 19 AUG 10
MASK DONNING
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
OXYGEN
FIXED OXYGEN SYSTEM FOR COCKPIT - DESCRIPTION
A330/A340 FLEET DSC-35-20-10 P 7/8
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
OXYGEN
FIXED OXYGEN SYSTEM FOR COCKPIT - DESCRIPTION
A330/A340 FLEET DSC-35-20-10 P 8/8
FCOM 19 AUG 10
MASK STOWAGE
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
OXYGEN
FIXED OXYGEN SYSTEM FOR COCKPIT - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-35-20-20 P 1/6
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to: ALL
(1) CREW SUPPLY pushbutton
This pushbutton controls the solenoid valve.
On : The valve is open, and supplies low pressure oxygen to the masks (normal position in
flight).
OFF: The valve is closed, and the white light comes on.
LATERAL CONSOLES
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
OXYGEN
FIXED OXYGEN SYSTEM FOR COCKPIT - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-35-20-20 P 2/6
FCOM 19 AUG 10
(1) Blinker flowmeter (yellow)
This indicator flashes when oxygen is flowing.
(2) RESET / TEST control slide
The crewmember presses the slide, and pushes it in the direction of the arrow to test: The
operation of the blinker, the regulator supply, the system sealing downstream of the valve, and
the regulator sealing and system operation. Pressing the RESET control slide, after the oxygen
mask has been used, cuts off the oxygen and the mask microphone.
(3) OXY ON flag
As soon as the left flap door opens, the mask is supplied with oxygen and, once it closes (mask
still supplied with oxygen), the “OXY ON“ flag appears.
CREW OXYGEN MASK
Applicable to: ALL
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
OXYGEN
FIXED OXYGEN SYSTEM FOR COCKPIT - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-35-20-20 P 3/6
FCOM 19 AUG 10
PRESSURE REGULATOR
Applicable to: ALL
(1) Red grips
Squeezing the righthand side grip unlocks the two-flap door and permits the harness to inflate.
(2) EMERGENCY pressure selector
Use of this selector creates an overpressure which eliminates condensation and prevents
smoke, smell or ashes from entering the mask.
‐ Pressing this knob generates an overpressure for a few seconds.
‐ Turning the knob, in the direction of the arrow, generates a permanent overpressure.
Note: Overpressure supply is automatically started, when cabin altitude exceeds 30 000 ft
.
(3) N/100 % sel
This two-position button is locked down (100 % position) when the crewmember pulls the mask
out of the stowage. Pushing up the button from underneath releases it, and it pops up to the N
(normal) position. Pressing it again returns it to 100 %.
100 % : The mask delivers 100 % oxygen.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
OXYGEN
FIXED OXYGEN SYSTEM FOR COCKPIT - CONTROLS AND INDICATORS
A330/A340 FLEET DSC-35-20-20 P 4/6
FCOM 19 AUG 10
N : The mask delivers a mixture of air and oxygen, the content of which varies with
cabin altitude. When cabin altitude goes above 35 000 ft, the air inlet closes
and the wearer breathes 100 % oxygen.
ECAM DOOR/OXY PAGE
Applicable to:
(1) OXY high pressure indication
It is in green, when the pressure is greater than, or equal to 400 PSI.
　
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