PAPI and VASI systems are used to provide pilots with what kind of guidance during approach?

• A. Lateral guidance along the runway centerline.
• B. Instrument landing system frequency guidance.
• C. Vertical guidance to approach and land safely.
• D. Meteorological weather data.

Answer: (C)

Vertical guidance during approach is provided by PAPI and VASI. These are visual glide-path indicators that give pilots a cue about their descent angle relative to the runway, helping them stay on the proper glide path to a safe touchdown. They show whether you are above, on, or below the desired slope, so you can adjust pitch to maintain a stable approach. This is different from lateral guidance along the runway centerline (that comes from systems like the ILS localizer) and from weather data, which these indicators do not provide. The key idea is that PAPI and VASI guide the vertical profile of the approach to ensure a safe, controlled descent to the runway.