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The crew oxygen bottle contains 50.0 cubic feet (1.419 liters) of oxygen and is located
in an enclosure behind the entrance storage compartment. Normal bottle charge
pressure is 1850 psi at 70_F (12.76 MPa at 21_C). The enclosure is well ventilated
with a permanent flow of ECS air to the under floor avionics compartment. The air is
then dumped overboard through the outflow valve.
The bottle assembly consists of a manual (lever type) shut-off valve, regulator, pressure
gauge, pressure transducer, pressure switch, and a pressure relief valve.
The bottle outlet is monitored by a pressure transducer. If the outlet pressure
decreases below 1410 psig (9.721 MPa), the EICAS will display an OXY LO PRESS
caution message on the primary page.
Output pressure is regulated to between 60 and 85 psig. If the output exceeds 94 psig,
a low pressure relief valve opens venting the oxygen. The cylinder is protected from
over pressure by a frangible high pressure relief valve. If the cylinder pressure reaches
2500 to 2775 psig, the valve ruptures and the oxygen is vented overboard through the
high pressure discharge indicator on the left side of the forward fuselage.
The pressure switch monitors the outlet pressure from the regulator. If the pressure
decreases below 45 psig, an OXY LO PRESS caution message will be displayed on the
EICAS primary page.
NOTE
If the OXY LO PRESS caution message is displayed,
the crew should refer to the dispatch requirements
charts.
When the contents of the oxygen bottle is vented through the high pressure discharge
indicator, a green snap disc dislodges, presenting a visual indication that the oxygen
cylinder contents have been vented. The oxygen servicing panel is located on the right
side of the forward fuselage. The service panel contains a fill port, a pressure servicing
chart and a pressure gauge. Check valves in the fill and supply lines, prevent loss of
oxygen when the bottle is removed or when the cylinder replenishment source is
disconnected.
Vol. 1 09--20--2
EMERGENCY EQUIPMENT
Oxygen REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Crew Oxygen System --- Schematic
Figure 09---20---1
P
PNEUMATIC SIGNAL LINE
PRESSURE GAUGE
FILL VALVE
OVERBOARD
DISCHARGE
INDICATOR
CB2--P11
GROUND SERVICE PANEL
MANUAL SHUTOFF HANDLE
PRESSURE
REGULATOR
CREW OXYGEN
MASK CONTAINER
CREW OXYGEN CYLINDER
TO EICAS
PRIMARY AND
SECONDARY
DISPLAY
Vol. 1 09--20--3
EMERGENCY EQUIPMENT
Oxygen REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Crew Oxygen System Components
Figure 09---20---2
HIGH PRESSURE
DISCHARGE INDICATOR
CREW OXYGEN CYLINDER
CREW OXYGEN MASK CONTAINER
Vol. 1 09--20--4
EMERGENCY EQUIPMENT
Oxygen REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Ground Service Panel
Figure 09---20---3
MAX. FILL PRESSURE VERSES
TEMPERATURE CORRECTION CHART
OXY. CYL. SERVICING
CHARGE CYL. AT RATE
NOT TO EXCEED
200 PSI/MIN
TO ”FULL” PRESSURE
FULL
PRESS. PSI
AMBIENT
1990 38
1900 27
1805 16
1710 5
1620 --7
1530 --18
1435 --29
1340 --40
GROUND SERVICE PANEL
PRESSURE GAUGE
500
1000
1500
0 2000
USE NO OIL
OXYGEN
SUPPLY PRESSURE
PSI
GROUND SERVICE PANEL
Vol. 1 09--20--5
EMERGENCY EQUIPMENT
Oxygen Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
C. Crew Oxygen Mask
The crew oxygen masks are located in stowage boxes. One for the pilot, one for the
copilot and one for the 3rd flight crew position. The crew mask is a full face mask and
includes an oxygen regulator, a pneumatically controlled inflatable harness, a
flow-control knob, a mixture-control lever and a microphone. To release the mask from
the stowage box, the operator squeezes the red release levers and holds them. This
action opens the quick-release doors, frees the mask and inflates the harness. The
operator then dons the mask. The red levers are then released, which deflates the
harness, causing the mask to install correctly on the operator’s head. <1033>
Oxygen is supplied to the mask regulator at about 78 psig (538 kPa). The regulator
control (N/100% positions) allows the user to select a mixture of oxygen and air or pure
oxygen.
S When the regulator control is set to the N position, a mixture of ambient air and
pressurized oxygen is supplied to the mask on demand.
S With the control set to the 100% position, pure oxygen is supplied to the mask on
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