What is the primary purpose of the glideslope in instrument approaches?

• A. It provides vertical guidance during instrument approaches.
• B. It provides horizontal guidance during visual approaches.
• C. It determines minimum safe altitude.
• D. It defines wind correction angles.

Answer: (A)

The main idea is that the glideslope provides vertical guidance during instrument approaches. It tells you whether you’re above or below the ideal descent path and by how much, allowing you to descend along a precise glide angle (typically around 3 degrees) to the runway. This vertical guidance is used in combination with the localizer, which handles horizontal guidance to keep you on the runway’s centerline. The glideslope itself does not determine minimum safe altitudes, nor does it define wind correction angles—that’s handled by other aspects of flight planning and pilot inputs.