Editing Visual approach slope indicator (section)

==Tri-color VASI==
[[File:Tri-color visual approach slope indicator.png|thumb|left|Tri-color VASI]]
A tri-color system consists of a single-light unit projecting a three-color visual approach path. Below the glide path is indicated by red, on the glide path is indicated by green, and above the glide path is indicated by amber. When descending below the glide path, there is a small area of dark amber. Pilots should not mistake this area for an “above the glide path” indication.<ref>{{Cite PHAK|year=2023|chapter=14|page=17}}</ref>