Cockpit Instrument Landing System Threshold 
Flight Training Central
JULY 12, 2024
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.
Pilot Institute
SEPTEMBER 24, 2024
You might have heard pilots talking about the Instrument Landing Systems (ILS). The ILS is a type of approach pilots use to land. The aerials are in a position that provides a threshold crossing height of 50ft. It consists of lights that start at the landing threshold and extend into the approach area.
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