Back course (BC)

Back Course (BC)

A back course, also known as a BC, refers to the reciprocal of a localizer course for an Instrument Landing System (ILS). In simple terms, it is an approach that allows an aircraft to land on an instrument runway by approaching it from the opposite end in which localizer antennas are installed.

During a BC approach, a pilot approaches the runway from the opposite end, facing away from its normal direction. The localizer signal, which is usually received by the aircraft from behind, instead, approaches from the front. This approach is typically used when the main approach is temporarily unavailable or when ATC clearance is given.

During the BC approach, pilots use an ILS glide slope as a guide to maintain the correct altitude. The approach path is opposite, and because of that, pilots must have a clear understanding of the airport’s layout and communicate accurately with ATC to avoid any confusion.

A BC approach is a challenging maneuver that requires continuous attention and high precision from the pilot. It is an important skill for any commercial pilot and a crucial component of Instrument Flight Rules (IFR) training.