Definition
A personal pre-flight self-assessment checklist used by pilots to evaluate their own fitness to fly. Each letter prompts the pilot to honestly check one area that can degrade performance: Illness (am I sick?), Medication (am I taking anything that affects me?), Stress (am I under pressure from work, family, finances?), Alcohol (have I had any recently, and is enough time clear?), Fatigue (am I rested enough?), and Emotion (am I emotionally settled, not grieving, angry, or distracted?). If any item raises a concern, the pilot is expected to delay or cancel the flight.
Plain English
A short personal checklist a pilot runs through before flying to make sure they themselves are in good enough shape to fly safely. It covers six areas of human condition that can quietly make a pilot unsafe without them noticing.
Context Anchor
Used during preflight planning, flight instruction, and go/no-go decisions before a flight.
Derivation
IMSAFE is a memory aid (mnemonic) built from the first letter of each item it checks. The word 'safe' sits inside the acronym on purpose so the pilot remembers the goal of the check.
Why Pilots Care
It helps prevent accidents by catching impairment from everyday human factors before they affect aircraft control.
Intuition Check
Do not treat IMSAFE as a paperwork step or a pass-fail score. It is a personal safety check that helps the pilot decide whether flying today is a good idea.
Example Sentence 1
Before driving to the airport, she ran through the IMSAFE model and decided that her head cold and the medication she had taken made it a no-go day.
Example Sentence 2
During the briefing the instructor asked the student to run through the IMSAFE model to confirm fitness for the cross-country flight.