What does VASI stand for in aviation?

The term VASI stands for Visual Approach Slope Indicators. This system is designed to provide visual guidance to pilots during the approach and landing phase. It helps pilots determine if they are on the correct glide slope for landing, which is essential for safely approaching the runway.

VASIs typically consist of a system of lights that indicate whether the aircraft is above, below, or on the ideal approach path. The lights change colors to inform the pilot of their height relative to the desired glide slope. This is particularly helpful during low visibility conditions or for pilots who may not have exact altitude measurements available.

Understanding VASI and its function is crucial for pilots as it enhances safety during landings and assists in maintaining the appropriate descent rate, contributing to successful landings.