All definitions
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Illness – Is the pilot suffering from any illness or symptom of an illness which might affect them in flight,
Medication – Is the pilot currently taking any drugs (prescription or over-the-counter),
Stress – Psychological or emotional factors which might affect the pilot’s performance,
Alcohol – Although legal limits vary by jurisdiction (20 mg/mL blood in the UK,[2](0.04 or greater in the USA)[3] one quarter that for driving), the pilot might want to consider their alcohol consumption within the last 8 to 24 hours,
Fatigue – Has the pilot had sufficient sleep and rest in the recent past, and
Eating – Is the pilot sufficiently nourished?
Source FAA Aeronautical Information Manual 8-1-1 · checked 26 Aug 2026