Honda Aircraft Company
HA-420 SYSTEMS
POM DESCRIPTION
HJ1-29000-005-001
October 30, 2016 1-153
OXYGEN
The Crew and Passenger Oxygen System (CPOS) consists of an oxygen
source, servicing connections and gauges, crew oxygen distribution and
control and cabin oxygen distribution and control.
Oxygen is stored in a single 50 cubic foot, 1850 psig oxygen bottle.
Attached to the oxygen bottle is a pressure regulator that regulates the
oxygen pressure supplied to the crew and passengers to approximately
80 psig. Integrated into the pressure regulator is an over pressure relief
system. In the event the oxygen bottle is subjected to an overpressure, a
burst disk will rupture venting the oxygen overboard removing a green
disc located on the lower left hand skin of the nose of the aircraft. The
low pressure supply is provided with a pressure relief valve that provides
a back-up to the oxygen pressure regulator.
Pushing/pulling the SUPPLY knob opens/closes a mechanical valve at
the high pressure source. All low pressure oxygen is vented when the
valve is closed. A temperature/pressure transducer is used for providing
the volume of oxygen remaining.
When the CABIN knob is in the NORM position, the cabin masks will
automatically deploy at a cabin pressure altitude of 14,500 ± 500 feet.
Deployment of the cabin masks can be commanded by selecting the
DROP MASK position. Selecting the OFF position isolates the cabin
from the oxygen supply.
Crew Oxygen
Both crew positions are provided with a Pressure Demand, Quick Don
crew oxygen mask. The regulators are part of the mask. Masks are
stored in stowage boxes (one for each pilot) specifically designed for
quick mask donning to allow the crew to don the mask in under
5 seconds. Pushing the red levers on the side of the mask together allows
FOR TRAINING PURPOSES ONLY
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General