What does it indicate if a VASI shows four red lights?

What does it indicate if a VASI shows four red lights?

• A. The plane is on a proper glide path
• B. The plane is below glide path
• C. The plane is too high for landing
• D. The plane is in a holding pattern

Answer: (B)

If a VASI (Visual Approach Slope Indicator) displays four red lights, it indicates that the aircraft is below the proper glide path. The VASI system uses colored lights to provide visual guidance to pilots approaching a runway. When all four lights are red, it signals to the pilot that they are too low and need to ascend to reach the optimal glide angle for landing. This information is critical for ensuring a safe approach and landing, as being below the glide path can increase the risk of obstacles and misalignment with the runway.

If a VASI (Visual Approach Slope Indicator) displays four red lights, it indicates that the aircraft is below the proper glide path. The VASI system uses colored lights to provide visual guidance to pilots approaching a runway. When all four lights are red, it signals to the pilot that they are too low and need to ascend to reach the optimal glide angle for landing. This information is critical for ensuring a safe approach and landing, as being below the glide path can increase the risk of obstacles and misalignment with the runway.