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demand.
The flow control knob is used to adjust the oxygen flow. If the knob is turned clockwise
to the EMERGENCY position, the mask is supplied a constant flow of 100% oxygen at
a positive pressure. To test the oxygen flow, press the flow control knob, which
momentarily supplies oxygen to the mask.
When cabin altitude is more than 30,000 feet (9,144 meters), the mask supplies pure
oxygen regardless of the N/100% switch position.
To remove the mask, the red release levers on the mask are squeezed, which inflates
the harness to allow the mask to be removed from the operators head.
Vol. 1 09--20--6
EMERGENCY EQUIPMENT
Oxygen REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Crew Oxygen Mask
Figure 09---20---4
Release Levers (red)
Squeeze to unlock
container doors, grasp
levers and hose and
pull to withdraw mask.
Oxygen On Flag (white)
In view when mask is out
to indicate that oxygen
shut--off valve is open.
Test/Reset Lever
Press to test oxygen
flow.
Blinker
Shows yellow cross
when oxygen is
flowing or when
harness is inflated.
Black, indicates no
oxygen flow.
Oxygen Supply Hose Flow Control Knob
Used to adjust the supply pressure.
N/100% Regulator Control
N -- Provides a mixture of
ambient air with oxygen.
100% -- Provides 100%
oxygen.
OXYGEN
MASK
N
100%
PUSH
PRESS
TO
TEST
AND
RESET
Vol. 1 09--20--7
EMERGENCY EQUIPMENT
Oxygen REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Full Face Mask <1033>
Figure 09---20---5
Flow Control Knob
Used to adjust supply
pressure.
Full Face Mask
Mask, goggles and pneumatic
harness can be donned with one
hand and functioning in 5 seconds.
N/100 Regulator Control
N -- Provides a mixture of
ambient air with oxygen.
100 -- Provides 100
oxygen.
Vol. 1 09--20--8
EMERGENCY EQUIPMENT
Oxygen REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
EICAS Oxygen Display <1001>
Figure 09---20---6
PASS OXY ON caution (amber)
Indicates that the passenger oxygen
system has been activated.
BRT
Status Page
Primary Page
OXY LO PRESS caution (amber)
Indicates that the flight compartment
oxygen bottle is low.
Check dispatch
requirements.
Vol. 1 09--20--9
EMERGENCY EQUIPMENT
Oxygen REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
D. Minimum Flight Crew Oxygen Pressure
NOTE
The EICAS indication of the oxygen pressure is corrected for
OAT.
Table 1 defines the oxygen system pressure as indicated on the EICAS which
corresponds to the quantity of oxygen necessary to perform an emergency descent
followed by a continuous cruise at 10,000 feet with normal (N) mask setting (FAR
121.333).
Table 2 defines the oxygen system pressure as indicated on the EICAS which
corresponds to the quantity of oxygen necessary to perform an unpressurized
continuous cruise at 10,000 feet for 15 minutes with normal (N) mask setting (JAR OPS
1.780).
Table 1 -- 50 cu. ft. Oxygen Bottle
Mi i P ( i)
2 Crew 1175
Minimum Pressure psi)
3 Crew 1629
Table 2 -- 50 cu. ft. Oxygen Bottle (JAA)
Mi i P ( i)
2 Crew 378
Minimum Pressure psi)
3 Crew 436
The utilization of the above table is as follows:
S If oxygen pressure is greater than that given in Table 1, then there is enough oxygen
to perform an emergency descent from 41,000 feet to 10,000 feet in 10 minutes,
followed by 110 minutes of cruise at 10,000 feet.
S If oxygen pressure is between the values given in Tables 1 and 2, then there is
enough oxygen to cruise at 10,000 feet for 15 minutes in an unpressurized cabin.
<JAA>
S If oxygen pressure is lower than that given in Table 2, the oxygen bottle has to be
refilled. <JAA>
Vol. 1 09--20--10
EMERGENCY EQUIPMENT
Oxygen Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
E. Crew Oxygen Consumption Data (As per FAR 121.333)
The following tables show the total time (in hours and minutes) that oxygen will be
available at various mask settings, during various flight conditions, at initial bottle
pressures of 1410 psi (pressure threshold that triggers OXY LOW PRESS message on
the EICAS) and 1850 psi (max. crew oxygen bottle pressure). A margin of safety of
10% was subtracted from the full charge of 1850 psi in all cases.
Vol. 1 09--20--11
EMERGENCY EQUIPMENT
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