Plain English Meaning

A turn that follows a fixed-radius curve along the ground, like tracing a section of a circle. The aircraft holds the same distance from the center of the turn the whole way around, instead of drifting wider or tighter as wind or speed changes.

Full Definition

A type of RNP turn defined by a fixed radius arc between two waypoints, allowing the aircraft to follow a precise, repeatable curved path regardless of wind or groundspeed. Known in RNP procedure design as a Radius-to-Fix (RF) leg, the flight management system maintains the specified radius to the turn's terminating fix.

Context Anchor

Seen in RNP instrument approach procedures, especially where the published path must curve around , , or .