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Why Do Airports Need ILS Antennas At The End Of Runways?

Simple Flying

An Instrument Landing System (ILS) is a precision runway approach system that aids pilots during their approach and landing phases of flight. The aid is based on two radio beams, which together provide pilots with both vertical and horizontal guidance during an approach to land.

Runway 105
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ILS approach with Spencer Suderman to Jacksonville Int’l

Flight Training Central

The Instrument Landing System (ILS) is a precision approach and provides both lateral and vertical guidance to a runway. For most general aviation operations, it allows a pilot to descend to as low as 200′ AGL and assist a pilot in locating the runway in as low as 3/8 mile visibility.

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Ask a CFI: What is an ILS critical area and when should I hold short?

Flight Training Central

This identifies the critical area for the instrument landing system, located near the ILS antenna array, where an airplane on the ground (or vehicle) in that space could interfere with the radio signals for airplanes flying an ILS instrument approach.