# 17-31-056

visual approach slope indicator

aeronautical ground light, or system of lights, designed to indicate the correct angle of descent to an aircraft making an approach to land

Note 1 to entry: This entry was numbered 845-11-57 in IEC 60050-845:1987.

Note 2 to entry: This entry was numbered 17-1405 in CIE S 017:2011.

Publication date: 2020-12