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OXYGEN SYSTEM
Two oxygen cylinders, located side by side in the cabin ceiling,
supply oxygen for the system. The left-hand cylinder
is
equipped with
a pressure regulator which reduces cylinder pressure to an operating
pressure of 70 psi. A line from the right-hand cylinder is connected
to this same regulator, and oxygen is supplied from both cylinders
simultaneously. A shut-off valve is included as part of the regulator
assembly to control the flow from both cylinders. An oxygen cylinder
filler valve is located in the right wing root and is accessible by re
moving the small cover plate on top of the right wing leading edge.
Cylinder pressure is indicated by a pressure gage located in the
OXYGEN DURATION CHART
144 CUBIC FEET CAPACITY)
1800
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overhead console.
Six oxygen outlets are provided; two in the overhead oxygen console
and four in the cabin ceiling just above the side windows, one at each of
the rear seating positions. One permanent, microphone-equipped mask
is provided for the pilot, and five disposable type masks are provided for
the passengers. All masks are the partial rebreathing type, equipped
with vinyl plastic hoses and flow indicators. Storage space for six masks
is provided in the overhead console and is accessible by opening the sliding
cover.
A remote shut-off valve control, located in the overhead console,
is used to shut off the supply of oxygen to the system when not in use.
The control is mechanically connected to the shut-off valve at the cyl
inders. With the exception of the shut-off function, the system is com
pletely automatic and requires no manual regulation for change of altitude.
OXYGEN SYSTEM OPERATION.
Prior to flight, check to
be
sure that there is an adequate oxygen
supply for the trip, by noting the oxygen pressure gage reading. Refer
to paragraph OXYGEN DURATION CALCULATION, and to the Oxygen
Duration Chart (figure 7-3). Also, check that the face masks and hoses
are accessible and in good condition.
Supplemental oxygen should be used by all occupants when cruising
above 10,000 feet. As described in the Cessna booklet "Man At Altitude, "
it
is often advisable to use oxygen at altitudes lower than 10,000 feet
under conditions of night flying, fatigue, or periods of physiological or emo
1·')
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600
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2 3 4 5 6
7
8
9
OXYGEN DURATION - (HOURS)
NOTE. This chart is baud on a pilot with an orang. calor-coded oxygen
line fitting and panen"e .. with gr•• n color.cod.d line fitting ••
Figure 7-3 .
7-13
.
.
7-12
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