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Honda Aircraft Company
HA-420
SYSTEMS
POM
DESCRIPTION
Normal Mode
At cabin altitudes between 8,000 and 30,000 feet, the regulator delivers
oxygen diluted with ambient air when the user inhales. At cabin
altitudes between 30,000 and 35,000 feet, the regulator delivers 100%
oxygen. At cabin altitudes above 35,000 feet, the regulator delivers
100% oxygen through positive pressure.
100% Oxygen Mode
At cabin altitudes below 35,000 feet, the regulator delivers 100% oxygen
when the user inhales. At cabin altitudes above 35,000 feet, the regulator
delivers 100% oxygen through positive pressure.
Emergency Mode
The regulator delivers 100% oxygen through positive pressure regardless
of cabin altitude.
Crew Mask Storage
The mask stowage provides the ability to test the flow of oxygen and test
the microphone without removing the mask from the stowage box.
Opening the doors of the stowage box (or pushing the test button) starts
the flow of oxygen to the mask mounted regulator. The face of the
stowage box provides a flow indicator that is used to confirm flow of
oxygen. Integral to the mask stowage box is a valve which prevents low-
pressure oxygen from feeding the mask-mounted regulator when the
mask is stowed.
Smoke goggles, designed to fit with the crew oxygen mask, are stored in
the bottom of the stowage box. The smoke goggles are vented with
oxygen from a vent on the crew oxygen masks.
HJ1-29000-005-001
October 30, 2016
1-155
FOR TRAINING PURPOSES ONLY
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