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approach lighting system
system of aeronautical ground lights that is sited in front of the threshold of an aerodrome runway and designed to provide guidance to aircraft making an approach to land on the runway
Note 1 to entry: This entry was numbered 845-11-54 in IEC 60050-845:1987.
Note 2 to entry: This entry was numbered 17-53 in CIE S 017:2011.