Which sequence describes the order of marker beacons from outermost to innermost on an ILS?

Which sequence describes the order of marker beacons from outermost to innermost on an ILS?

• A. Middle Marker, Outer Marker, Inner Marker
• B. Inner Marker, Middle Marker, Outer Marker
• C. Outer Marker, Inner Marker, Middle Marker
• D. Outer Marker, Middle Marker, Inner Marker

Answer: (C)

The order tested is the actual physical placement along the approach: markers are encountered from farthest to closest to the runway. So, you reach the outer marker first, then the middle marker, and finally the inner marker near the threshold. This progression helps pilots identify how close they are to the runway and, for precision approaches, provides increasingly precise guidance. The color codes also help: outer marker is blue, middle marker is amber, and inner marker is white. Therefore, the sequence from outermost to innermost is Outer Marker, Middle Marker, Inner Marker.

The order tested is the actual physical placement along the approach: markers are encountered from farthest to closest to the runway. So, you reach the outer marker first, then the middle marker, and finally the inner marker near the threshold. This progression helps pilots identify how close they are to the runway and, for precision approaches, provides increasingly precise guidance. The color codes also help: outer marker is blue, middle marker is amber, and inner marker is white. Therefore, the sequence from outermost to innermost is Outer Marker, Middle Marker, Inner Marker.