Which option lists the components of an ILS?

Which option lists the components of an ILS?

• A. Glideslope and Localizer
• B. Marker beacon
• C. Airport Lighting System
• D. Glideslope, Localizer, Airport Lighting System, Marker beacon

Answer: (D)

An Instrument Landing System gives you the tools for both horizontal and vertical guidance, plus the visual cues that help you align with and land from an instrument approach. The best choice includes the localizer for keeping you on the runway centerline (horizontal guidance), the glideslope for the correct descent angle (vertical guidance), marker beacons that provide fixed-position references along the approach, and the approach lighting system that gives you a visual cue to transition to landing, especially in poor visibility. These together form the full set of guidance and cueing components used on an ILS approach. The other options leave out one or more of these essential elements, making them incomplete.

An Instrument Landing System gives you the tools for both horizontal and vertical guidance, plus the visual cues that help you align with and land from an instrument approach. The best choice includes the localizer for keeping you on the runway centerline (horizontal guidance), the glideslope for the correct descent angle (vertical guidance), marker beacons that provide fixed-position references along the approach, and the approach lighting system that gives you a visual cue to transition to landing, especially in poor visibility. These together form the full set of guidance and cueing components used on an ILS approach. The other options leave out one or more of these essential elements, making them incomplete.