What are the three major components that a pilot uses for an ILS approach?

What are the three major components that a pilot uses for an ILS approach?

• A. Localizer, Glideslope, Marker Beacons
• B. Localizer, Marker Beacons, DME
• C. Localizer, VOR, Marker Beacons
• D. Glideslope, ADF, Marker Beacons

Answer: (A)

An ILS approach relies on three elements: a localizer for horizontal alignment with the runway centerline, a glideslope for vertical guidance along the descent path, and marker beacons that provide precise crossing/fix points along the approach. The localizer steers you left or right to stay on the runway centerline; the glideslope tells you whether you’re above or below the correct descent path so you can fly the proper angle to the runway. Marker beacons give audible and visual cues at known distances from the runway to confirm your position and altitude as you approach the threshold. While newer systems can substitute marker signals with other distance-measuring techniques, these three components are the core elements of an ILS approach. Navigation aids like VOR or ADF are separate systems and not part of the ILS path.

An ILS approach relies on three elements: a localizer for horizontal alignment with the runway centerline, a glideslope for vertical guidance along the descent path, and marker beacons that provide precise crossing/fix points along the approach. The localizer steers you left or right to stay on the runway centerline; the glideslope tells you whether you’re above or below the correct descent path so you can fly the proper angle to the runway. Marker beacons give audible and visual cues at known distances from the runway to confirm your position and altitude as you approach the threshold. While newer systems can substitute marker signals with other distance-measuring techniques, these three components are the core elements of an ILS approach. Navigation aids like VOR or ADF are separate systems and not part of the ILS path.