... This means that it will 'help' the pilot of an aircraft fitted with ILS equipment to make an approach to an airport that is equipped with ILS transmitting equipment. Although it sounds very simple a design it is actually rather more complicated and uses many different methods of communications that I will discuss later. The pilot flies his aircraft along a course delineated by the intersection of two radio beams. These beams activate an indicator in the aircraft that contains a horizontal needle sensitive to deviations from the glide slope (vertical deviation indicator) and a vertical needle sensitive to deviations from the localizer path (horizontal deviation indicator). By keeping both needles centred, the pilot can guide his aircraft down to the end of the landing runway aligned with the runway centre line. Radio marker beacons are also installed at several locations along the approach path to tell the pilot on ...

See this essay or coursework document in full right now