What does MM stand for in ILS terminology?

What does MM stand for in ILS terminology?

• A. Middle Marker
• B. Minor Marker
• C. Main Marker
• D. Terminal Marker

Answer: (A)

MM stands for the Middle Marker. In an ILS, marker beacons provide position cues along the final approach. The Outer Marker is farther out and is typically blue; the Middle Marker lies closer to the runway and uses an amber light with a distinctive tone to signal a specific point on the final approach, helping you verify you’re on the glide slope and approaching the runway in a precise manner. Not every ILS installation includes a middle marker, but when MM is indicated, it designates this middle-position marker.

MM stands for the Middle Marker. In an ILS, marker beacons provide position cues along the final approach. The Outer Marker is farther out and is typically blue; the Middle Marker lies closer to the runway and uses an amber light with a distinctive tone to signal a specific point on the final approach, helping you verify you’re on the glide slope and approaching the runway in a precise manner. Not every ILS installation includes a middle marker, but when MM is indicated, it designates this middle-position marker.