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OXYGEN DURATION CALCULATION.
The Oxygen Duration Chart (figure
ing 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 availa ble 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 flight.
intersecting the line, drop down vertically to the bottom of the chart
and read the 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 6 hours and 15 minutes.
same pressure will sustain the pilot and three passengers for approx
2
imately
hours and 30 minutes.
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.
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.
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 cylinder, when fully charged, contains approximately
48 cubic feet of oxygen, under a pressure of 1800 psi at 70°F.
pressures will vary, however, due to the ambient temperature in the
filling area, and because of the temperature rise resulting from com
pression of the oxygen.
not result in a properly filled cylinder. Fill to the pressures indicated
in the table on the following page for ambient temperature.
7-2)
NOTE
If orange color-coded hoses are
Because of this, merely filling to 1800 psi will
should be u sed in determin
This is accom
After
.
The
Filling
7-9
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