instrument landing system

== English == === Noun === instrument landing system (plural instrument landing systems, abbreviation ILS) (aviation) A collection of radio navigation aids (always including a localizer and glideslope, and often one to three marker beacons as well) used by pilots for approach guidance to a specific airport runway, especially when visibility is limited. ==== Coordinate terms ==== VHF omnidirectional range (VOR) precision approach landing indicator (PAPI) approach lighting system (ALS) ==== Related terms ==== instrument guidance system (IGS) microwave landing system (MLS)