At what altitude is the middle marker usually located from the runway?

The middle marker is typically located 3,500 feet from the runway threshold. This positioning is a standard part of Instrument Landing System (ILS) approaches, providing critical guidance to pilots during the final stages of the landing approach. The middle marker signals that the aircraft is at a position where it is approximately a half-mile from the runway. It serves to inform pilots about their progress along the approach path and can be especially useful during low-visibility conditions.

Knowing this distance helps pilots determine when to start preparing for landing, adjusting their descent rate, and aligning with the runway. This information is crucial in IFR operations where precision and timing are key to safe landings.