Definition
A VHF Omnidirectional Range navigation facility physically located on the airport grounds, used as the final approach fix or final approach navaid for a non-precision instrument approach to that same airport.
Plain English
A VOR ground station that sits on the airport itself, so the approach is flown directly to or from the station rather than to a separate fix some distance away.
Context Anchor
Seen on instrument approach procedures and approach charts for VOR approaches.
Derivation
On-airport' means physically on the airport property. 'VOR' stands for 'VHF omnidirectional range': a very-high-frequency radio aid that lets an aircraft determine its direction from the station. Together, the phrase means the VOR station is located on that airport.
Why Pilots Care
Its location determines whether a straight-in landing is possible or a circling maneuver will be required after reaching the missed approach point.
Intuition Check
Do not read 'on-airport' as 'on the runway' or 'at the terminal.' It means the VOR station is located somewhere on the airport property and serves that airport's procedure.
Example Sentence 1
Because this is an on-airport VOR, station passage marks the missed approach point rather than a separate timed fix.
Example Sentence 2
With the VOR located on-airport, the pilot planned a circling maneuver to reach the active runway after the missed approach point.