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tional disturbances. Also, the habitual and excessive use of tobacco or al
cohol will usually necessitate the use of oxygen at less than 10, 000 feet.
NOTE
For safety reasons, no smoking should be allowed
in the aircraft while oxygen is being used.
When ready to use the oxygen system, proceed as follows:
(1) Select mask and hose.
NOTE
The hose provided for the pilot is of a higher flow rate
than those for the passengers;
it
is color-coded with
an orange band adjacent to the plug-in fitting. The
passenger hoses are color-coded with a green band.
If
the aircraft owner prefers, he may provide higher
flow rate hoses for all passengers. In any case, it
is recommended that the pilot use the larger capacity
hose. The pilotts mask is equipped with a microphone
to facilitate the use of the radio while using oxygen.
An adapter cord is furnished with the microphone
equipped mask to mate the mask microphone lead to
the auxiliary microphone jack located at the left edge
of the instrument panel. To connect the oxygen mask
microphone, connect the mask lead to the adapter cord
and plug the cord into the auxiliary microphone jack.
(In aircraft that are equipped with the optional boom
microphone, it will be necessary to disconnect the
boom microphone lead from the auxiliary microphone
jack so that the adapter cord from the oxygen mask
microphone can be plugged into the jack). A switch is
incorporated on the pilot's control wheel to operate
the microphone.
(2) Attach mask to face and adjust metallic nose strap for snug mask
fit.
(3) Select oxygen outlet located nearest to the seat you are occupy
ing, and plug delivery hose into
it.
When the oxygen supply is turned
on, oxygen will flow continuously at the proper rate of flow for any
altitude without any manual adjustments.
(4) Position oxygen supply control knob "ON. "
(5) Check the flow indicator in the face mask hose. Oxygen is flow
ing if
the indicator is being forced toward the mask.
(6) Unplug the delivery hose from the outlet coupling when discontin
uing use
of
oxygen system. This automatically stops the flow of oxygen.
(7) Position oxygen supply control knob "OFF.
!f
OXYGEN DURATION CALCULATION.
The Oxygen Duration Chart (figure 7 -3) should be used in determin
lug
the usable duration (in hours) of the oxygen supply in your airplane.
The following procedure outlines the method
of
finding the duration from
the chart.
(1) Note the available oxygen pressure shown on the pressure gage.
(2) Locate this pressure on the scale on the left side of the chart,
then go across the chart horizontally to the right until you intersect
the line representing the number of persons making the fUght. After
intersecting the line, drop down vertically to the bottom of the chart
and read tht: duration in hours given on the scale.
(3) As an example of the above procedure, 1400 psi of pressure will
safely sustain the pilot only for nearly 5 hours and 45 minutes. The
same pressure will sustain the pilot and three passengers for approx
imately 2 hours and 20 minutes.
NOTE
The Oxygen Duration Chart is based on a standard con
figuration oxygen system having one orange COlor-coded
hose assembly for the pilot and green color-coded hoses
for the passengers.
If
orange color-coded hoses are
provided for pilot and passengers, it will be necessary
to compute new oxygen duration figures due to the greater
consumption of oxygen with these hoses. This is accom
plished by computing the total duration available to the
pilot only (from "PILOT ONLY" line on chart), then di
viding this duration by the number of persons (pilot and
passengers) using oxygen.
OXYGEN SYSTEM SERVICING.
The oxygen cylinders, v,hen fully charged, contain 44 cubic feet
of
oxygen (22 cubic feet each cylinder), under a pressure
of
1800 psi at
70°F. Filling pressures will vary, however, due to the ambient temper
lature
m
the
filling
area,
and
heoause
of
the temperature rise
result~_15
7-14
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