What does the letter "I" stand for in the IMSAFE self-assessment before each flight?

The letter "I" in the IMSAFE self-assessment stands for "Illness." This model is designed to help pilots evaluate their physical and mental readiness before flying. Each component of IMSAFE stands for a different aspect of the pilot's condition that could affect their performance.

Illness refers specifically to any medical condition or symptom that could impair a pilot's ability to operate an aircraft safely. Recognizing illness as a factor is crucial because even mild symptoms can affect judgment, reaction times, and overall flying performance. For example, a cold or headache can distract a pilot and lead to mistakes. Therefore, pilots are encouraged to assess their health status accurately to ensure they are fit to fly, thereby enhancing safety for themselves and others in the airspace.