Definition
The act of a pilot terminating an active IFR (Instrument Flight Rules) flight plan with ATC, either in the air or on the ground, ending IFR services and clearances for the remainder of the flight. Once cancelled, the pilot operates under VFR (Visual Flight Rules) and is no longer protected by IFR separation, clearances, or controlled airspace privileges associated with the IFR flight plan.
Plain English
Telling air traffic control that you no longer need to be on your instrument flight plan. After you cancel, you are flying on your own under visual rules and ATC stops providing IFR services for the rest of the flight.
Context Anchor
Seen during instrument approaches, including point-in-space helicopter approaches, and when arriving at airports or landing sites where the pilot must tell air traffic control that IFR service is no longer needed.
Derivation
Cancel comes from a Latin word meaning to cross out or make void. That helps here because canceling IFR makes the active IFR clearance no longer in effect.
Why Pilots Care
Reduces ATC workload and gives the pilot greater flexibility in routing and altitude once visual references are available.
Grounding Statement
Once IFR is canceled in the air, the flight is no longer continuing under the instrument clearance and must have the visibility and cloud clearance needed for visual flight.
Intuition Check
Canceling IFR does not mean the flight is over. It means the IFR clearance or flight plan is being ended; the aircraft may still be flying under visual rules, or the pilot may be closing the flight plan after landing.
Example Sentence 1
With the airport in sight and clear skies below, the pilot called ATC and said, 'Cancel IFR.'
Example Sentence 2
Once established in visual conditions, the crew called to report canceling IFR and proceeded visually to the airport.