What is a non-precision approach?

A non-precision approach is defined as a procedure that provides lateral guidance only, typically utilizing navigational aids such as VOR (VHF Omnidirectional Range) or NDB (Non-Directional Beacon). This means pilots follow a specific flight path horizontally but do not receive vertical guidance to assist in their descent.

In contrast, precision approaches, such as those based on Instrument Landing System (ILS) procedures, provide both lateral and vertical guidance, allowing for a more controlled and accurate approach to landing. Non-precision approaches require pilots to be more vigilant in managing their altitude since they have to rely on visual references or altitude indications to determine their descent profile, as vertical guidance is not provided.

This lack of vertical guidance is the key characteristic that differentiates non-precision approaches from precision approaches. Thus, the definition aligns perfectly with the understanding of how a non-precision approach is structured and executed in aviation.