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end from hazards that could affect the safe and efficient operation of aircraft arriving and departing the airport, standards contained in Federal Aviation Regulations (F.A.R.) Part 77, Objects Affecting Navigable Airspace, have been established for use by local authorities to control the height of objects near the airport. The Part 77 Airspace Plan included in this master plan is a graphic depiction of this regulatory criterion. The Part 77 Airspace Plan is a tool to aid local authorities in determining if proposed development could present a hazard to the airport and obstruct the approach path to a runway end. This Airspace Plan can be a critical tool for the airport agency's use in planning against future development limitations. This may result in the control by easement or in fee simple purchase for the purpose of protecting the future role ofthe airport. This could especially be true in the instance of San Marcos as the city looks to the future in support of the anticipated Part 139 operations which rely heavily on the best navigational technology, affording the most precise approaches at the lowest cloud ceiling heights and runway visibility minimums available. To this purpose the following discussion will describe those approach surfaces that make up the recommended F.A.R. Part 77 operations at San Marcos Municipal Airport. F.A.R. Part 77 Imaginary Surfaces The Part 77 Airspace Plan assigns three-dimensional imaginary areas to each runway. These imaginary surfaces emanate from the runway centerline and are dimensioned according the visibility minimums associated with the approach to the runway end and size of aircraft to operate on the runway. The Part 77 imaginary surfaces include the primary surface, approach surface, transitional surface, horizontal surface, and conical surface. Part 77 imaginary surfaces are described in the following paragraphs. . PRIMARY SURFACE The primary surface is an imaginary surface longitudinally centered on the runway. The primary surface extends 200 feet beyond each runway end. The elevation of any point on the primary surface is the same as the elevation along the nearest associated point on the runway centerline. Under Part 77 regulations, the primary surface for the future approaches to Runways 12-30 and Runways 17-35 is 1,000 feet wide. For all others (Runways 8-26 and 4-22) the primary surface remains 500 feet wide. . APPROACH SURFACE An approach surface is also established for each runway. The approach surface begins at the same width as the primary surface and extends upward and outward from the primary surface end and is centered along an extended runway centerline. The approach surface for the approach to Runway 12 extends 50,000 feet from the end of the primary surface at an upward slope of 50 to 1 to a width of 16,000 feet. Runway 30, at the opposite end, is 5-8