T
RAINING
M
ANUAL
–
L
ANCAIR
IV/IVP
regulators. The mask is designed so the oxygen can be diluted with ambient air
by allowing the user to exhale around the face piece, and comes with a
rebreather bag which allows the individual to reuse pat of the exhaled oxygen.
The pilot’s mask sometimes allows greater oxygen flow than passenger’s masks.
Although certified up to 41,000 feet, very careful attention to system capabilities
is required when using continuous flow oxygen systems above 25,000 feet.
Diluter Demand and Pressure Demand Systems
Diluter demand and pressure demand systems supply oxygen only when the
user inhales through the mask. An automatic lever allows the regulators to
automatically mix cabin air and oxygen, or supply 100% oxygen, depending on
the altitude. The demand mask provides a tight sea over the face to prevent
dilution with outside air, and can be used safely up to 40,000 feet. Pilots who fly
at those altitudes should not have beards and moustaches because air can
easily seep in through the border of the mask. Pressure demand regulators also
create airtight and oxygen tight seals, but they also provide a positive pressure
application of oxygen to the mask face piece, which allows the user’s lings to
pressurize with oxygen. This feature makes pressure demand regulators safe at
altitudes above 40,000 feet.
Fire Danger
Pilots should be aware of the danger of fire when using oxygen. Materials that
are nearly fireproof in ordinary air may be susceptible to burning in oxygen. Oils
and greases, such as lipstick or chapstick, may catch fire if exposed to oxygen.
Oil should not be used for sealing the valves and fittings of oxygen equipment.
Smoking during any kind of oxygen equipment use must also be strictly
forbidden.
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©
Copyright
2007
LOBO
May
not
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copied
without
permission.