Plain English Meaning

A curved segment of a flight path that follows a perfect arc of a set distance from a center point, starting at one waypoint and ending at another. Instead of flying straight from point to point, the aircraft tracks a smooth curve of known size.

Full Definition

A curved flight path defined by a fixed radius from a center point, terminating at a named fix. The aircraft flies a precise circular arc of a specified radius, beginning at one waypoint and ending at another, with the center of the arc and the radius value published as part of the procedure. RF legs are flown by RNAV-equipped aircraft with the required navigation accuracy and authorization.

Context Anchor

Seen on RNAV , especially where the published path uses a precise curved turn between procedure points.