Aeromedical factorsQuestion 875 of 934

Which condition in flight can cause stagnant hypoxia?

  1. Flying in very dry air for several hours
  2. A very low rate of descent
  3. Smooth air at a low altitude
  4. Excessive acceleration of gravity (Gs)
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Correct answer: Excessive acceleration of gravity (Gs)

Stagnant hypoxia occurs when oxygen-rich blood does not move to the tissues. Excessive Gs and cold can cause it.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 17: Aeromedical Factors — Hypoxia, page 426

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Questions last reviewed: 18 October 2026