Flight Training - July 2021 - 52

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, and stop
Gun. Low ambient pressure can't force
enough oxygen through the lungs'
membranes and into the bloodstream,
so what is needed is a pressure-demand
oxygen system that delivers on-demand,
100-percent oxygen at a slightly positive
pressure. It inflates the lungs, and the
user must force the air from his or her
lungs to exhale.
The FARs state that in a pressurized
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aircraft, a single pilot must wear an oxygen
mask when flying above FL350 and
the cabin altitude exceeds 14,000 feet.
There's a caveat: If two pilots are at the
controls and each has a quick-donning
mask, there's no need to wear a mask
below FL410. A quick-donning mask is
one that can be put on with one hand
in 5 seconds, but it must be able to be
secured, sealed, and providing oxygen
within that time frame.
Pilots and passengers will breathe
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oxygen either through a cannula, which
is a cylindrical tube that fits under
the nose; or through an oral-nasal
rebreather mask that fits over the nose
and mouth. Cannulas are simple and
easy to use, and they allow the wearer
to talk or eat while wearing them, but
they can be less effective if the wearer
52
FLIGHT TRAINING JULY 2021
breathes through his or her mouth.
The FARs limit cannulas to 18,000
feet. Rebreather masks may be worn
up to 25,000 feet. Above 25,000 feet,
the mask must seal over the nose and
mouth so as not to allow outside air to
mix into the oxygen.
Oxygen equipment must be preflighted,
and the FAA suggests you use
the acronym PRICE to help you remember
how to inspect the equipment.
Pressure: Ensure there is enough
oxygen pressure and quantity to complete
the flight.
Regulator: Inspect the regulator for
proper function.
Indicator: Put on the mask and check
the flow indicator to assure a steady flow
of oxygen.
Connections: Ensure all connections-oxygen
lines, plug-in coupling,
and mask-are secure.
Emergency: Have equipment ready to
use for emergencies that call for oxygen
(hypoxia, decompression sickness,
smoke, fumes, rapid decompression).
Brief passengers on the location and use
of oxygen. FT
jill.tallman@aopa.org
An oral-nasal rebreather mask may be used up to 25,000 feet. It has a better fit than a cannula and
increases the percentage of oxygen the wearer inhales.
MIKE FIZER

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Flight Training - July 2021

Table of Contents for the Digital Edition of Flight Training - July 2021