From Wikipedia, the free encyclopedia
Jump to: navigation, search

IMSAFE is a mnemonic used by some aircraft pilots to assess their fitness to fly.[1]


The mnemonic is interpreted as:

  • 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?

Some sources [4] give the Emotion.


  1. ^ "Flight Fitness: The "I'm Safe" Checklist". FAA Medical Certification. Pilot Medical Solutions, Incorporated. Retrieved 20 December 2011. 
  2. ^ Implementation of the Railways and Transport Safety Act 2003, section 2.3
  3. ^
  4. ^ FAA Risk Management Handbook FAA-H-8083-2 uses "Eating" on the title page of Chapter 3, and "Emotion" in Figure 3-3, two pages hence.