What is the Glide Slope's function?

• A. To provide horizontal guidance.
• B. To identify the runway threshold.
• C. To provide vertical descent path guidance to the runway.
• D. To illuminate the runway edge lights.

Answer: (C)

Glide slope provides vertical descent path guidance to the runway. It’s the vertical component of the Instrument Landing System, giving you a precise angle (about 3 degrees) to follow as you descend toward the runway. By staying centered on the glide slope, you continuously fly the proper descent path, ensuring a stabilized approach and a safe touchdown point. The horizontal part of the approach is handled by the localizer, not by the glide slope. And identifying the runway threshold or illuminating runway edge lights isn’t the glide slope’s job.