Definition
A vehicle/pedestrian deviation (V/PD) is the unauthorized entry, presence, or movement of a vehicle, person, or animal onto the movement area of an airport — including runways, taxiways, and safety zones — without permission from air traffic control. V/PDs are tracked by the FAA as a category of runway safety incidents alongside pilot deviations and operational errors.
Plain English
It’s when a vehicle, person, or animal goes onto a runway, taxiway, or other controlled part of the airport without being cleared to be there.
Context Anchor
Seen in runway safety, airport surface operations, and pilot deviation discussions, especially when reviewing how unauthorized movement on runways or taxiways can create hazards.
Derivation
Deviation comes from a Latin idea meaning “to turn aside from the path.” In FAA use, a deviation is not just any small difference; it means an action that strays from an instruction, rule, or approved procedure.
Why Pilots Care
These events create runway incursion risks and can force go-arounds or emergency stops.
Grounding Statement
Picture a service truck crossing a runway without permission while an aircraft is cleared to land—that kind of unauthorized ground movement is the danger V/PDs are meant to identify.
Intuition Check
Do not read “deviation” here as a small harmless variation. In this FAA context, a V/PD is a safety event involving a person or vehicle not following the required authorization or instructions on the airport surface.
Example Sentence 1
Tower reported a V/PD when a maintenance truck crossed the hold short line without clearance.
Example Sentence 2
Strict gate procedures help reduce V/PDs on the airport movement area.