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dependent upon crew setting of the flow controls.
The flight crew oxygen system is a diluter demand system. The flight crew oxygen
masks are of the quick-donning, inflatable harness type. Each mask is stowed in a
quick access container adjacent to each flight station (one each at the side consoles).
A regulator in each mask provides, by pilot selection, three different oxygen supply
modes:
• Normal diluted demand mode
• 100 percent oxygen on demand mode
• 100 percent oxygen continuous flow pressure mode
When stowed in the container, the oxygen flow through the regulator can be tested by
pressing the test lever. Each mask is equipped with a microphone.
In the event of cabin depressurization, oxygen for the passengers is supplied by the
same oxygen system as for the crew, via the altimetric valve to the passenger drop out
mask boxes in the cabin.
The oxygen masks are installed in overhead compartments and are available at all
passenger seats and in the lavatories.
All oxygen compartment doors will open to present the oxygen masks automatically if
cabin altitude reaches approximately 14,500 feet.
When the oxygen compartment doors open, the passengers will pull the oxygen mask
to their face, pulling the lanyard and pin from the generator. This initiates the flow of
oxygen to the passenger’s oxygen mask.
For Training Purposes Only
Sept 04
8-5
P I LOT T R A I N I N G GU I D E
EMERGENCY EQUIPMENT
OXYGEN GROUND SERVICE PANEL
0
500
1000
1500
2000
USE NO OIL
OXYGEN
SUPPLY PRESSURE
PSI
A
A
D
C
B
B
C
D
OXY.H.P
RELIEF
OVERBOARD DISCHARGE
INDICATOR
GROUND SERVICE PANEL
PRESSURE GAUGE
GX_08_003
OXYGEN CYLINDER SERVICING: CHARGE CYLINDER AT
RATE NOT TO EXCEED 200 PSI/MIN TO “FULL” PRESSURE
AMBIENT TEMP °F
FULL PRESS PSI
100
1990 1900 1805 1710 1620 1530 1435 1340
80 60 40 20 0 -20 -40
P I LOT T R A I N I N G GU I D E
EMERGENCY EQUIPMENT
8-6 For Training Purposes Only
Sept 04
CREW MASK STORAGE
A
A
A
GX_08_004
For Training Purposes Only
Sept 04
8-7
P I LOT T R A I N I N G GU I D E
EMERGENCY EQUIPMENT
CREW MASK
OXYGEN
MASK
PRESS
TO
TEST
AND
RESET
EROS
EMERGENCY
100%
PUSH
OXYGEN
MASK
PRESS
TO
TEST
AND
RESET
EROS
EMERGENCY
100%
PUSH
Normal/100% Lever
100%
• N provides a mixture
of Ambient air with
oxygen on demand.
• provides 100%
oxygen on demand.
RESET/TEST Lever
(spring-loaded to RESET)
Press to test oxygen flow
(momentarily) through the
regulator (microphone
test without pulling the
mask out).
Blinker
Shows yellow cross
when oxygen is flowing
or when harness is
inflated. When black,
indicates no oxygen flow.
Release Levers
Squeeze to unlock
container doors, grasp
levers and hose and
pull to withdraw mask.
Oxygen On Flag
In view, when mask is out.
Indicates that oxygen shutoff valve is open.
Flag will disappear when shutoff valve closed.
Reset position shuts off supply to mask regulator
and blinker unit.
Emergency Flow Control
• Located on panel under the oxygen
supply hose.
• Rotate on in direction of arrow to supply
emergency pressure.
• Press to check whether emergency
pressure flow will be available.
Oxygen Supply Hose
Oxygen Supply Hose
OXY
ON
GX_08_005
P I LOT T R A I N I N G GU I D E
EMERGENCY EQUIPMENT
8-8 For Training Purposes Only
Sept 04
CREW MASK
Harness
Protective Film
Strip (detachable)
Mask
Harness Manual
Inflation Control
Normal 100% Manual Regulator
Control Lever
Microphone
GX_08_006
For Training Purposes Only
Sept 04
8-9
P I LOT T R A I N I N G GU I D E
EMERGENCY EQUIPMENT
PASSENGER OXYGEN
The passenger oxygen control panel located on the copilot’s side panel has a rotary
switch that lets the crew choose between three operating modes of the altimetric valve.
When the cabin altitude reaches 14,500 feet (+500/-750 feet), a message will appear
on EICAS, when the altimetric valve is set at NORMAL and there is oxygen flow in
the passenger compartment.
THERAPEUTIC
OXYGEN
ON
PASSENGER OXYGEN NORMAL
CLOSED OVERRIDE TEST PORT
　
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