Page 141 - PPL-engelsk 2025
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Human Performance
If you adjust your mixture to contain twice as much oxygen, approximately 40%,
you will have the same oxygen pressure at 18,000 feet as at sea level.
2.3.4.2 Oxygen deficiency at altitude
When we talk about oxygen deficiency (hypoxia), 10,000 feet is the altitude at
which we must start considering the consequences of oxygen deprivation.
If you are a smoker and/or in poor physical condition, your starting altitude may
be 4,000–5,000 feet instead of sea level!
Hypoxia is a condition in which the body does not get enough oxygen to
maintain normal function. At altitudes where oxygen levels are low,
hemoglobin’s ability to bind and transport oxygen can be challenged—resulting
in hypoxia.
Take a look at this figure:
It could hardly be stated more clearly!
The dangerous thing about oxygen deprivation is that as
it occurs, you lose the ability to recognize it!
Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 141
