Glideslope (GS) is part of the ILS that projects a radio beam upward at approximately how many degrees from the approach end of the runway, providing vertical guidance on the final approach?

• A. A beam projecting upward at approximately 3° from the approach end of the runway.
• B. A beam projecting downward at 3° from the runway.
• C. A horizontal beam at 1° above the runway.
• D. A vertical beam at 6° above the runway.

Answer: (A)

Glideslope provides vertical guidance by delivering a radio beam set at about 3 degrees relative to the runway, projecting upward from the approach end. Following this glide path on the final approach gives you a steady, controlled descent to the runway threshold. The 3° angle is standard because it yields a practical descent rate across a range of speeds and distances while maintaining safe obstacle clearance.