Airplanes Ceiling Instrument Landing System 
Pilot Institute
FEBRUARY 12, 2025
In busy airspace (Class B, C, D, and E surface areas), airport beacons are often turned on during the day when ground visibility is less than 3 miles or the ceiling is less than 1,000 feet. When Are Airport Beacons Used? Speaking of ATC, they can turn beacons on or off at some airports.
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.
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