The Visual Approach Slope Indicator (VASI) provides descent guidance information during the approach. Which color combination indicates you are on the correct glidepath?

• A. Red over White
• B. White over Red
• C. All Red
• D. All White

Answer: (A)

VASI uses two vertically arranged rows of lights to show your height relative to the published glidepath. The color pattern you should see when you’re on the proper glidepath is Red over White—the upper row shows red and the lower row shows white. This combination tells you you’re aligned with the descent path. If you see White over Red, you’re above the glidepath and need to descend to bring the indication toward Red over White. All red or all white indicate you’re significantly off the path and must correct accordingly.