An above glide slope indication from a tricolor VASI is...

An above glide slope indication from a tricolor VASI is represented by an amber light signal. The VASI (Visual Approach Slope Indicator) is a system designed to provide visual guidance to pilots during their approach to land, indicating whether they are too high, too low, or on the correct glide path.

When a pilot sees an amber light, it signifies that they are above the optimum glide slope. This warning prompts pilots to descend to achieve the correct altitude for safe landing. The amber light is positioned specifically to alert pilots without being overly alarming, guiding them to make necessary adjustments.

In contrast, the red light signal indicates that the aircraft is below the correct glide slope, while the green light signals that the aircraft is on the glide slope. The white light indicates an even higher position that is not part of the glide path approach, confirming that the pilot is at a higher altitude than necessary. Therefore, the amber light serves the critical function of alerting pilots to their positioning above the intended glide path.