Definition
An ATC clearance that allows a pilot operating on an IFR flight plan to fly at a VFR altitude of their choice instead of an assigned IFR altitude, provided VFR weather conditions and cloud-clearance requirements are maintained. The pilot remains on the IFR flight plan and is still subject to IFR rules for flight plan, position reporting, and ATC communication, but selects altitude using VFR cruising altitude rules.
Plain English
It is a clearance that lets you stay on your IFR flight plan but pick your own altitude as long as you stay in clear-of-clouds conditions and follow the usual VFR altitude rules for your direction of flight.
Context Anchor
Seen in IFR en route operations, especially after a pilot climbs through or above clouds and requests to continue in visual conditions while still keeping the IFR flight plan active.
Derivation
“VFR” means visual flight rules. “On top” refers to being above a cloud layer, where the pilot can see and remain in visual weather. “Clearance” means an authorization from air traffic control, not just informal permission.
Why Pilots Care
Gives the pilot visual reference and potentially smoother air or better weather while retaining the safety net of IFR traffic separation and controller support.
Grounding Statement
Picture climbing through a cloud layer, breaking out into clear air above it, and receiving permission to continue IFR while choosing a legal visual-flight altitude.
Intuition Check
Do not read “VFR-on-top” as canceling IFR. It means you are still on an IFR clearance, but you are operating in visual conditions at a VFR-appropriate altitude.
Example Sentence 1
After climbing through the overcast layer, the pilot requested a VFR-on-top clearance so they could level off in smooth air above the clouds.
Example Sentence 2
With the VFR-on-top clearance in effect, the aircraft continued to report position while flying in clear air above the overcast.