7-22 OXYGEN SYSTEM
The oxygen system for the aircraft consists of either a 115 or 50 cubic foot
oxygen bottle, a regulator/valve assembly with an integral ller port and
overpressure protection device, a display/logic controller, and associated
lines, ttings and sensors to provide supplemental oxygen throughout the
cabin.
Oxygen is required to be used by the pilot for ight time in excess of 30
minutes above 12,500 feet and above 14,000 feet for the duration of the ight
above 14,000 feet. If climbing to an altitude where oxygen is required, it is
recommended that at approximately 10,000 feet, the pilot should begin using
oxygen. Passengers are required to be supplied with oxygen above 15,000
feet.
OXYGEN REGULATOR / BOTTLE ASSEMBLY
The regulator / bottle assembly is located in the aft fuselage and may be
accessed by removing the aft bulkhead panel. Depending upon conguration,
a 50 cubic foot or 115 cubic foot bottle may serve the standard 2-place
oxygen system, and a 115 cubic foot bottle is used for the 10-place oxygen
system. The bottles consist of a composite wrapped construction and are
manufactured to DOT-3AL/2015 with a maximum cylinder pressure of 1850
PSI at room temperature (76°F). The high pressure side of the regulator
includes the charging valve, pressure gauge, pressure transducer, and the
overpressure burst disc assembly. The low-pressure side of the regulator
includes a valve assembly for reducing bottle pressure to low-pressure for
distribution. An ON-OFF switch is provided on the oxygen display panel to
electrically activate, through a solenoid, the valve assembly for turning on
and off the ow of oxygen to the cabin low pressure dispensing systems. A
pressure transducer is attached to the high pressure manifold of the regulator.
This pressure transducer is electrically connected to the oxygen control panel
pressure indication.
NOTE: When the oxygen tank pressure drops below 400 psi, the green
“400 psi” light will go out, and the red “empty” light will go on. The red light
indicates oxygen tank pressure below 400 psi.
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