Instrument Rating Checkride Practice Test

The Middle Marker (MM) is typically located at a distance of 3500 feet from the runway threshold. This is an important point in the Instrument Landing System (ILS) approach, serving as an indication of the aircraft's position in relation to the runway during the final stages of landing. The MM provides altitude information to pilots as they descend toward the runway, helping them confirm that they are on the correct glide path.

The reason this marker is positioned at 3500 feet is due to the average stopping distance and the altitude at which pilots would begin to expect the runway to come into sight during a non-precision approach. Unlike the Outer Marker (OM), which is set further out (typically 4-7 miles), the Middle Marker assists pilots in making critical decisions as they approach the runway and is instrumental in ensuring safety during the landing phase.

In contrast, the other options do not align with standard practices for Middle Marker placement, as they are either too far from the runway threshold or not representative of established navigation auxiliary markers used during the final approach to land safely.