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-2- The three major holdups preventing Category II operations are: runway work in progress of the need to hold up Category II work on existing runways pending completion of other work (10 locations), lack of high-intensity centerline lights (8 locations) and glide slope problems (7 locations). Attachment 3 contains excerpts from a cost-benefit study made for FAA by R. Dixon Speas and Associates. This study concludes that Category II has immediate net economic benefits, and that Category IIIa/b provides net benefits if more than 23 airports are implemented with Category !!! facilities by 1975. Copies of this report are available from FAA Systems Research and Development Service. Attachment 4 contains excerpts from an unpublished FAA staff study of Cost/Benefit of All-Weather Landing Systems, dated October 1967. Of particular interest are the distributions of poor weather over the country, prepared by the National Weather Research Center at Ashevile, North Carolina; and the estimated cost of weather-caused flight disruptions at a number of airports. Clifton F. von Kann Vice President Operations & Engineering 4/560. Attachments: FAA Category II Status Report ATA Summary of Category II Ground Implementation Excerpts from Cost/Benefit Analysis (R. Dixon Speas Associates) Excerpts from Unpublished from Unpublished FAA Staff Study