What color is the middle marker (MM) light?

The middle marker (MM) light is amber in color. This designation is part of standard aviation signaling systems, where different colors serve specific purposes. The amber color for the middle marker indicates an important phase during the approach to a runway, particularly when pilots are conducting an instrument landing approach.

In an ILS (Instrument Landing System) approach, the middle marker is used to signal that the aircraft is at a predetermined distance from the runway threshold, typically 3,500 feet. The amber light acts as a visual cue for pilots to prepare for landing, and it is strategically placed to be visible during the critical phases of a flight.

Understanding the color code system in aviation is crucial for safe navigation and communication, as each color provides specific information to pilots about their proximity to the runway and the type of landing approach being executed.