Definition
The state of sustained attention and alert watchfulness maintained by a pilot or crew member to detect and respond to changes in the aircraft, environment, or flight situation.
Plain English
Staying actively alert and watchful at all times during flight, ready to notice and react to anything that changes.
Context Anchor
Pilots use vigilance during all phases of flight, especially while taxiing, scanning for other aircraft, watching weather, and monitoring the airplane’s condition.
Derivation
From the Latin vigilantia, meaning wakefulness or watchfulness. The same root gives us 'vigil.' In aviation, it carries this original sense of staying awake and attentive — not just present, but actively watching.
Why Pilots Care
It is essential for collision avoidance and maintaining situational awareness, directly reducing the risk of mid-air incidents.
Grounding Statement
Imagine a pilot repeatedly sweeping their eyes across the sky and instrument panel instead of assuming everything is fine.
Intuition Check
Vigilance does not just mean being awake or generally careful. In aviation, it means actively looking, listening, and monitoring for changes that matter to the flight.
Example Sentence 1
Long cruise legs in smooth air can dull a pilot's vigilance, making it easier to miss a subtle change on the engine instruments.
Example Sentence 2
In instrument conditions, vigilance includes regularly cross-checking the attitude indicator and heading.