Plain English Meaning

The deliberate steps you take to fight off tiredness so it does not affect your flying. Things like sleeping properly, eating well, staying hydrated, exercising, and taking breaks when you can.

Full Definition

The set of practical actions a pilot or aviation professional uses to prevent, reduce, or recover from fatigue so that performance and situational awareness are not compromised. Recognized countermeasures include adequate sleep before duty, proper nutrition and hydration, regular physical exercise, scheduled rest breaks, limiting workload during low-alertness periods, and, where authorized, short controlled rest periods. Countermeasures address fatigue at its source rather than masking its symptoms.

Context Anchor

Seen in human factors and flight instructor discussions, especially when explaining how fatigue can reduce a pilot’s ability to during a lesson or .