AOPA Turbine Pilot Magazine - April 2020 - T-8
T-8 | AOPA PILOT April 2020
the air sacs. Physics dictates that oxygen
will travel from high to low pressure,
ensuring adequate oxygenation of the
blood.
At very high altitude, however, the
ambient pressure of atmospheric oxygen
is lower than the pressure of the oxygen
in the blood, and the flow of oxygen is
reversed. Now oxygen is pulled out of the
bloodstream and into the lungs, depriving body tissues of a continuous supply.
Holding your breath won't work because
blood-oxygen saturation still declines.
Without a fast, fresh supply of oxygen, a
pilot exposed to the ambient air at very
high altitudes is in a dire situation.
Enter the oxygen system-typically
one of the simpler systems in turbine
aircraft. Gaseous oxygen is stored under
pressure (commonly around 1,800 psi
when full) in a metal bottle that is generally located in a nose compartment.
This high-pressure oxygen travels into
a combined shutoff valve and pressure
regulator-which, when open, reduces
bottle pressure to a much lower value
(commonly 70 psi) before the supply
PREFLIGHT CHECKS include a look at
oxygen pressure levels (below, left) and
smoke goggles (bottom), plus a check of
the oxygen mask mode switch (below).
CHRIS ROSE
task of donning an oxygen mask before
complete unconsciousness ensues.
Pilots of turboprop airplanes, which
are most efficient flying at altitudes in
the range of 25,000 to 28,000 feet, also
face diminished capability when pressurization is lost. At 25,000 feet, time of
useful consciousness is three to five minutes; at 28,000 feet, it's from 2.5 to three
minutes. If the depressurization is rapid
or explosive, time of useful consciousness can be half those values, depending
on the pilot's physical condition.
Pilots sometimes have difficulty
understanding this concept, figuring
they may be able to hold their breath
for a minute or more. But here's where
it's critical to understand how oxygen
is transported from the lungs to tissue. Lining the 300 million alveoli-air
sacs-within our lungs are walls of such
thinness that gas can be forced through
them and into the circulatory system,
and vice-versa. At sea level the ambient
pressure of oxygen in the lungs is significantly higher than the pressure of the
oxygen present in the blood surrounding
AOPA Turbine Pilot Magazine - April 2020
Table of Contents for the Digital Edition of AOPA Turbine Pilot Magazine - April 2020
Contents
AOPA Turbine Pilot Magazine - April 2020 - Intro
AOPA Turbine Pilot Magazine - April 2020 - Cover1
AOPA Turbine Pilot Magazine - April 2020 - Cover2
AOPA Turbine Pilot Magazine - April 2020 - Contents
AOPA Turbine Pilot Magazine - April 2020 - 2
AOPA Turbine Pilot Magazine - April 2020 - 3
AOPA Turbine Pilot Magazine - April 2020 - 4
AOPA Turbine Pilot Magazine - April 2020 - 5
AOPA Turbine Pilot Magazine - April 2020 - 6
AOPA Turbine Pilot Magazine - April 2020 - 7
AOPA Turbine Pilot Magazine - April 2020 - 8
AOPA Turbine Pilot Magazine - April 2020 - 9
AOPA Turbine Pilot Magazine - April 2020 - 10
AOPA Turbine Pilot Magazine - April 2020 - 11
AOPA Turbine Pilot Magazine - April 2020 - 12
AOPA Turbine Pilot Magazine - April 2020 - 13
AOPA Turbine Pilot Magazine - April 2020 - 14
AOPA Turbine Pilot Magazine - April 2020 - 15
AOPA Turbine Pilot Magazine - April 2020 - 16
AOPA Turbine Pilot Magazine - April 2020 - 17
AOPA Turbine Pilot Magazine - April 2020 - 18
AOPA Turbine Pilot Magazine - April 2020 - 19
AOPA Turbine Pilot Magazine - April 2020 - 20
AOPA Turbine Pilot Magazine - April 2020 - 21
AOPA Turbine Pilot Magazine - April 2020 - 22
AOPA Turbine Pilot Magazine - April 2020 - 23
AOPA Turbine Pilot Magazine - April 2020 - 24
AOPA Turbine Pilot Magazine - April 2020 - 25
AOPA Turbine Pilot Magazine - April 2020 - 26
AOPA Turbine Pilot Magazine - April 2020 - 27
AOPA Turbine Pilot Magazine - April 2020 - 28
AOPA Turbine Pilot Magazine - April 2020 - G1
AOPA Turbine Pilot Magazine - April 2020 - G2
AOPA Turbine Pilot Magazine - April 2020 - 29
AOPA Turbine Pilot Magazine - April 2020 - 30
AOPA Turbine Pilot Magazine - April 2020 - 31
AOPA Turbine Pilot Magazine - April 2020 - 32
AOPA Turbine Pilot Magazine - April 2020 - 33
AOPA Turbine Pilot Magazine - April 2020 - 34
AOPA Turbine Pilot Magazine - April 2020 - 35
AOPA Turbine Pilot Magazine - April 2020 - 36
AOPA Turbine Pilot Magazine - April 2020 - 37
AOPA Turbine Pilot Magazine - April 2020 - 38
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AOPA Turbine Pilot Magazine - April 2020 - 40
AOPA Turbine Pilot Magazine - April 2020 - 41
AOPA Turbine Pilot Magazine - April 2020 - 42
AOPA Turbine Pilot Magazine - April 2020 - 43
AOPA Turbine Pilot Magazine - April 2020 - 44
AOPA Turbine Pilot Magazine - April 2020 - 45
AOPA Turbine Pilot Magazine - April 2020 - 46
AOPA Turbine Pilot Magazine - April 2020 - 47
AOPA Turbine Pilot Magazine - April 2020 - 48
AOPA Turbine Pilot Magazine - April 2020 - 49
AOPA Turbine Pilot Magazine - April 2020 - 50
AOPA Turbine Pilot Magazine - April 2020 - 51
AOPA Turbine Pilot Magazine - April 2020 - 52
AOPA Turbine Pilot Magazine - April 2020 - 53
AOPA Turbine Pilot Magazine - April 2020 - 54
AOPA Turbine Pilot Magazine - April 2020 - 55
AOPA Turbine Pilot Magazine - April 2020 - 56
AOPA Turbine Pilot Magazine - April 2020 - R-1
AOPA Turbine Pilot Magazine - April 2020 - R-2
AOPA Turbine Pilot Magazine - April 2020 - R-3
AOPA Turbine Pilot Magazine - April 2020 - R-4
AOPA Turbine Pilot Magazine - April 2020 - R-5
AOPA Turbine Pilot Magazine - April 2020 - R-6
AOPA Turbine Pilot Magazine - April 2020 - R-7
AOPA Turbine Pilot Magazine - April 2020 - R-8
AOPA Turbine Pilot Magazine - April 2020 - T-1
AOPA Turbine Pilot Magazine - April 2020 - T-2
AOPA Turbine Pilot Magazine - April 2020 - T-3
AOPA Turbine Pilot Magazine - April 2020 - T-4
AOPA Turbine Pilot Magazine - April 2020 - T5
AOPA Turbine Pilot Magazine - April 2020 - T-6
AOPA Turbine Pilot Magazine - April 2020 - T-7
AOPA Turbine Pilot Magazine - April 2020 - T-8
AOPA Turbine Pilot Magazine - April 2020 - T-9
AOPA Turbine Pilot Magazine - April 2020 - T-10
AOPA Turbine Pilot Magazine - April 2020 - T-11
AOPA Turbine Pilot Magazine - April 2020 - T-12
AOPA Turbine Pilot Magazine - April 2020 - T-13
AOPA Turbine Pilot Magazine - April 2020 - T-14
AOPA Turbine Pilot Magazine - April 2020 - T-15
AOPA Turbine Pilot Magazine - April 2020 - T-16
AOPA Turbine Pilot Magazine - April 2020 - T-17
AOPA Turbine Pilot Magazine - April 2020 - T-18
AOPA Turbine Pilot Magazine - April 2020 - T-19
AOPA Turbine Pilot Magazine - April 2020 - T-20
AOPA Turbine Pilot Magazine - April 2020 - T-21
AOPA Turbine Pilot Magazine - April 2020 - T-22
AOPA Turbine Pilot Magazine - April 2020 - T-23
AOPA Turbine Pilot Magazine - April 2020 - T-24
AOPA Turbine Pilot Magazine - April 2020 - 57
AOPA Turbine Pilot Magazine - April 2020 - 58
AOPA Turbine Pilot Magazine - April 2020 - 59
AOPA Turbine Pilot Magazine - April 2020 - 60
AOPA Turbine Pilot Magazine - April 2020 - 61
AOPA Turbine Pilot Magazine - April 2020 - 62
AOPA Turbine Pilot Magazine - April 2020 - 63
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AOPA Turbine Pilot Magazine - April 2020 - 65
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AOPA Turbine Pilot Magazine - April 2020 - 120
AOPA Turbine Pilot Magazine - April 2020 - Cover3
AOPA Turbine Pilot Magazine - April 2020 - Cover4
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