Definition
An incident in which a vehicle, person, or non-aircraft object enters any portion of an airport movement area (runways, taxiways, or safety areas) without authorization from air traffic control. These events are tracked by the FAA as a category of surface incident at towered airports and are a known contributor to runway incursion risk.
Plain English
When a car, truck, person, or other ground object goes onto a runway or taxiway when they were not cleared to be there. It is the ground-vehicle and person version of an aircraft straying somewhere it shouldn't be.
Context Anchor
Seen in runway safety discussions, airport surface operations, and FAA material about pilot deviations and runway incursions.
Derivation
Deviation comes from a Latin root meaning to turn aside from a path or road. That helps here because the event involves someone or something not following the authorized path or clearance on the airport surface.
Why Pilots Care
These events create runway incursions that can force an aircraft to go around or stop suddenly, raising collision risk.
Intuition Check
Do not read deviation here as just any small mistake. In this FAA context, it means an unauthorized or unsafe movement by a vehicle, pedestrian, or object on the controlled airport surface.
Example Sentence 1
The tower delayed our takeoff clearance after a fuel truck crossed the hold line, which was logged as a vehicle/pedestrian deviation.
Example Sentence 2
Runway incursion statistics include vehicle/pedestrian deviations along with pilot errors.