Definition
A personal preflight self-assessment checklist used by pilots to evaluate their own fitness to fly. Each letter prompts the pilot to honestly check one factor that could impair judgment, perception, or performance: Illness (am I sick?), Medication (am I taking anything that could affect me?), Stress (am I under pressure that could distract me?), Alcohol (have I consumed any recently, and am I within legal and safe limits?), Fatigue (am I rested enough?), and Emotion (am I emotionally stable enough to fly?). If any factor is a concern, the pilot is expected to delay or cancel the flight.
Plain English
A simple personal checklist a pilot runs through before flying to make sure they themselves are fit and ready to fly safely.
Context Anchor
Seen in preflight planning, flight instruction, and aeronautical decision-making discussions.
Derivation
An acronym formed from the first letter of each factor: Illness, Medication, Stress, Alcohol, Fatigue, Emotion. The word 'safe' is built into the mnemonic on purpose — it reminds the pilot that the goal of the check is personal safety before flight.
Why Pilots Care
It helps pilots spot conditions that could impair performance or judgment before they affect safety.
Intuition Check
IMSAFE does not mean simply feeling confident or saying “I’m safe.” It is a structured check of specific personal risk factors before flying.
Example Sentence 1
Before driving to the airport, she ran through the IMSAFE checklist and decided to cancel the flight because she was running a low-grade fever.
Example Sentence 2
Feeling unusually tired, she applied the IMSAFE criteria and postponed the cross-country flight.