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Attachment 3 R. DIXON SPEAS ASSOCIATES, INC. Manhasset, New York COST/BENEFIT ANALYSIS FOR ALL-WEATHER LANDING SYSTEM (AWLS) CATEGORY II AND III Authors: R. D. Speas, M. H. Smith, H. P. Schmidt October 1967 CONTRACT NO. FA67WA-1642 ABSTRACT This study determines the costs and benefits resulting from implementation of Category II and III all-weather systems during the 1967-1980 time period, and establishes the optimum practical ground-airborne implementation schedule, including the priority-ranked order for equipping forty individual airports. The implementation schedule calls for the following equipment effectiveness: (1) Category II by 1970, (2) Category IIIab by 1975, (3) Category IIIc by 1980. The cost benefits, as conservatively quantified in this study, show in general summary terms that: (1) Category II has immediate (by 1970) net economic benefits. (2) Category IIIa and IIIb show nearly the same results and provide net economic benefits if more than twenty-three airports are implemented by 1975. (3) Category IIIc will produce net economic benefits only if the majority of the forty airports are implemented by 1980.