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Hypoxia

Aeromedical

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Oxygen Deficiency

Hypoxia is a state of oxygen deficiency sufficient to impair function. The four types are hypoxic, hypemic, stagnant and histotoxic. Symptoms include euphoria, impaired judgement, cyanosis and tunnel vision — and the affected pilot is typically unaware.

Source FAA Aeronautical Information Manual · checked 2026-08-25

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