Plain English Meaning
How sharp and switched-on a pilot is. When alertness drops, thinking slows, attention narrows, and small mistakes become more likely.
Full Definition
The degree to which a pilot is mentally awake, attentive, and able to perceive, process, and respond to information in the cockpit. It is affected by physiological factors such as fatigue, dehydration, hypoxia, heat stress, illness, medication, and stress.
Context Anchor
Seen in human factors and aviation medical discussions, especially when checking for dehydration, heat exhaustion, heatstroke, fatigue, or other conditions that can affect .