One of the following types of runways intended for the operation of aircraft using instrument approach procedures: a) Non-precision approach runway. An instrument runway served by visual aids and a non-visual aid providing at least directional guidance adequate for a straight-in approach. b) Precision approach runway, category I. An instrument runway served by ILS and/or MLS and visual aids intended for operations with a decision height not lower than 60 m (200 ft) and either a visibility not less than 800 m or a runway visual range not less than 550 m. c) Precision approach runway, category II. An instrument runway served by ILS and/or MLS and visual aids intended for operations with a decision height lower than 60 m (200 ft) but not lower than 30 m (100 ft) and a runway visual range not less than 300 m. d) Precision approach runway, category III. An instrument runway served by ILS and/or MLS to and along the surface of the runway and: A - intended for operations with a decision height lower than 30 m (100 ft), or no decision height and a runway visual range not less than 175 m. B - intended for operations with a decision height lower than 15 m (50 ft), or no decision height and a runway visual range less than 175 m but not less than 50 m. C - intended for operations with no decision height and no runway visual range limitations.