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Human Performance
2.3.5.4 Blood donation
Pilots should not donate blood immediately before a flight, as this can affect
physical performance. Blood donation causes a temporary fluid loss, which may
lead to dizziness, fatigue, or dehydration - dangerous conditions during flight.
It is generally recommended that pilots wait 24 - 48 hours after donating blood
before flying. In some cases, a longer wait may be necessary.
2.3.5.5 Other causes of oxygen deficiency
- Carbon monoxide – from faulty exhaust systems or cabin heaters. Carbon
monoxide binds to blood cells more easily than oxygen, causing poisoning
without noticeable signs.
- Poor circulation – due to poor fitness or health conditions.
- Lung tissue damage – caused by alcohol, halogenated hydrocarbons from
chlorine-based fire extinguishers. Only use carbon dioxide or Halon
extinguishers if water or conventional methods fail to put out a fire.
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Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 145
