So this plane right here is not flying in regards to this antenna right here, but to the antenna at the far end of the runway it´s landing on)Īlso important to know, at the same time the localizer transmits the so called ILS facility identification code. They send out radio signals in the horizontal axis of the runway.(This is very often mistaken, as many airports have to Localizer antennas, for either direction of the runway. The so called localizer is an antenna array normally located beyond the end of the runway and generally is built up of several pairs of directional antennas. Besides that, you need the necessary ILS approach chart with important data like ILS frequency and identifier code, ILS inbound course and glide slope angle, given minimum descent altitudes or heights depending on the ILS category, and last but not least the go arround procedure. To fly an ILS approach, the aircraft has to be fitted with an adequate ILS receiver to display and converted the picked up signals on the cockpit instruments. So the Instrument landing system is a ground based radio navigation system giving pilots a lateral and vertical guidance towards the runway as they are in approach in IMC (Instrument Meteorological Conditions).

How does an ILS work? One of the most ask question regarding how an airplane flies towards the runway without any visual aids.

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