Back course (BC). The reciprocal of the localizer course for an ILS. When flying a back-course approach, an aircraft approaches the instrument runway from the end at which the localizer antennas are installed.
ILS Back Course (IBC).
Operation of ILS in which the runway is approached in reverse direction, giving only lateral guidance; Compare: ILS Front Course; ...
Back course is mirror of front course with reverse needle sensing.
ILS localizer has four times VOR sensitivity.
Backcourse approximates 8 times VOR sensitivity and twice that of the front course.
Sometimes as part of an instrument approach a pilot has to fly the wrong way on the localizer path, which is called flying the back course.
to a runway; ILS provides precision aiding for landing; ILS is usually part of a VOR station. A basic guidance mode, providing lateral guidance, longitudinal guidance, and vertical guidance to approach a runway for landing; in ILS back course, ...
 See also: Course, Instrument Landing System, Combi, Landing, Aviation
  
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