When using two-bar VASI lights, what indicates that you are on the proper glide slope?

When using a two-bar Visual Approach Slope Indicator (VASI), the correct indication that you are on the proper glide slope is signified when the near bar is white and the far bar is red. This configuration means that you are at the correct altitude for approach and descent, aligning with the optimal glide path to the runway.

The near bar being white indicates that you are above the prescribed glide slope, while the far bar being red advises that you are below the glide slope. Therefore, the combination of these two colored lights conveys that you are properly positioned along the approach path.

This specific lighting configuration is critical for pilots as it provides guidance for maintaining the appropriate descent angle during landing. Being aware of these signals helps ensure safety by preventing descents that are too steep or too shallow. Understanding this color-coding system is essential for effective navigation and successful landings.