Establishment Criteria for Category I Instrument Landing System (ILS)

This report develops revised establishment criteria for the Instrument Landing system ILS with approach lights based on benefitcost analysis, as follows 1 Air carrier airports with sustained turbojet operations are eligible for an initial ILS same as previous criteria. 2 At other than jet-use carrier airports and for multiple ILS installations, criteria are expressed as a function of a annual instrument approaches by user category, and b nonprecision approach minimums on the candidate ILS runway. For example, a runway at a nonhub air carrier airport without turbojet service that has nonprecision approach minimums of 500-1 is an ILS candidate with any combination of 350 air carrier, 375 air taxi, or 1,500 general aviation annual instrument approaches.