Definition
A descent profile determined for vertical guidance during a final approach. Under ICAO usage, glidepath refers to the prescribed vertical path an aircraft follows from a defined point down to the runway, whether that path is defined by an electronic signal (such as an ILS glide slope), a visual aid (such as PAPI or VASI), or a published descent gradient on a non-precision approach.
Plain English
The angled line in the sky that an aircraft is supposed to follow on its way down to the runway during the final part of an approach.
Context Anchor
Seen in instrument approach and landing guidance discussions, especially when describing whether the aircraft is above, below, or on the intended descent path.
Derivation
From 'glide' (descend without engine power, or in a smooth controlled descent) and 'path' (the route followed). Together: the route an aircraft glides along while descending to land. The ICAO tag indicates the term is used as defined by the International Civil Aviation Organization, which may differ slightly from FAA usage.
Why Pilots Care
Following the correct glidepath keeps the aircraft on the proper angle to reach the runway safely and avoid obstacles.
Grounding Statement
Picture an invisible sloping line leading down toward the runway; the glidepath is the line the aircraft is meant to follow.
Intuition Check
Glidepath does not mean any path an aircraft takes while gliding. In this context, it means the intended vertical descent path used for approach guidance.
Example Sentence 1
The crew intercepted the glidepath at 1,800 feet and continued the approach to the runway.
Example Sentence 2
Deviating below the glidepath requires an immediate correction to stay on the approach.