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SUPPLY LINE
CABIN OXYGEN
ALTIMETRIC VALVE
STOWAGE BOXES AND
PILOT/COPILOT
CREW OXYGEN MASKS
SWITCH
PRESSURE
TRANSDUCER
PRESSURE
EICAS
Cockpit/cabin supply line
Storage−cylinder fill line
HP Discharge line
LP Discharge line
HP Capillary lines for indication
EMERGENCY EQUIPMENT
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
08−10−2
OXYGEN BOTTLE
The oxygen bottles [1416 liter (50.0 cubic feet)] are located in the forward fuselage underfloor area.
Normal charge pressure at 21 °C (70 °F) is 1850 psi.
Charge pressure is indicated as follows:
· Gauge on the bottle regulator
· Gauge on the ground servicing panel
· Status page on the EICAS secondary display
When bottle pressure becomes excessive, approximately 2600 psi, all oxygen is vented overboard
by a pressure regulator unit working in conjunction with a fuselagemounted
relief valve.
Overpressure causes the OXY HP RELIEF disc, located on the left front fuselage to blow out.
The pressure regulator unit regulates flow to the crew mask regulator unit to 72.5 psi and the unit’s
strain gauge transmits pressure signals to EICAS.
The crew mask/regulator unit regulates the flow to the crew masks. Oxygen is supplied via the
regulator at either ambient or slightly over ambient pressure 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
quickdonning,
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, for three oxygen supply modes:
· Normal diluted demand mode.
· 100 percent oxygen on demand mode
· 100 percent oxygen continuous flow/variable pressure mode (emergency 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.
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, in the event of cabin depressurization.
The oxygen masks are installed in overhead compartments and are available at all passenger seats
and in the lavatory.
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.
EMERGENCY EQUIPMENT
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
08−10−3
OXYGEN GROUND SERVICE PANEL
GF0810_003
D
RATE NOT TO EXCEED 200 PSI/MIN TO "FULL" PRESSURE
AMBIENT TEMP ° F 100 80 60 40 20 0 −20 −40
FULL PRESS PSI 1990 1900 1805 1710 1620 1530 1435 1340
D
OXYGEN CYLINDER SERVICING: CHARGE CYLINDER AT
OVERBOARD DISCHARGE
INDICATOR
GROUND SERVICE PANEL
PRESSURE GAUGE
EMERGENCY EQUIPMENT
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
08−10−4
CREW MASK STORAGE
GF0810_004
EMERGENCY EQUIPMENT
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
08−10−5
CREW MASK
GF0810_005
Normal/100% Lever
of Ambient air with
oxygen on demand.
oxygen on demand.
Emergency Flow
Control
Rotate in direction of
arrow to supply a
continuous 100%
oxygen flow.
Rotate to adjust the
supply pressure.
Press to test whether
a continuous flow will
be available.
Oxygen Supply Hose
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.
RESET/TEST Lever
(springloaded
to
RESET)
Press to test oxygen
flow (momentarily)
through the regulator
(microphone test
without pulling the mask
out).
Oxygen On Flag
In view when mask is
out, indicates that
oxygen shutoff
valve is
open.
Flag will disappear
when shutoff
valve
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