What type of guidance does the glideslope beam provide?

The glideslope beam is an essential component of the Instrument Landing System (ILS), specifically designed to provide vertical descent guidance during an aircraft's approach to landing. When an aircraft is following the ILS, the glideslope beam helps determine the correct angle of descent to the runway. This guidance ensures that the aircraft descends at a safe and optimal angle, typically around 3 degrees, which is crucial for a stable approach and landing.

By offering precise vertical guidance, the glideslope beam enables pilots to maintain the correct glide path, improving landing accuracy and safety. It is particularly important in low-visibility conditions, where visual references to the runway may be limited. The glideslope works in conjunction with the localizer beam, which provides horizontal position guidance, allowing for a complete approach to landing.

In summary, the reason the answer is centered on vertical descent guidance is that the glideslope beam's primary function is to direct the aircraft in a controlled descent path, critical for safe landings.