This report develops revised establishment criteria for Distance Measuring Equipment (DME) with either Instrument Landing System (ILS) or localizer approach aids. The criteria are based upon analysis of DME payoffs versus the cost of providing and maintaining the equipment. This benefit/cost analysis considers the following factors: Use of DME in lieu of ILS outer marker beacon; Reduced probability of approach accidents; Averted flight disruptions due to reduced localizer minima; Averted missed approaches due to additional information provided; Expedited aircraft departures due to reduced departure flight path length. Former criteria concentrated on DME establishment for purposes of traffic expedition and approach minima reduction. Revised criteria consider, in addition to the foregoing, DME as a safety aid. The revised criteria identify 281 ILS runways and 35 localizer runways for DME establishment. At an average per-site equipment and installation cost of $62,900, the potential program cost is approximately $20 million. (Author).