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This identifies the critical area for the instrumentlandingsystem, 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.
You might have heard pilots talking about the InstrumentLandingSystems (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 landingthreshold and extend into the approach area.
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