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3.f DraftfALUCF/Compatibili4/Factorf Mapsf andf Policiesf <br /> 9.A. - Page 91 <br /> 3.2.4 Airspace Protection <br /> Similar to safety policies, airspace protection criteria are intended to reduce the risk of harm to <br /> people and property from an aircraft accident. This is accomplished by the establishment of <br /> compatibility policies that seek to prevent the creation of land use features that can be hazards to <br /> the airspace used by aircraft in flight and have the potential to cause an aircraft accident to occur. <br /> Such hazards may be physical,visual, or electronic. <br /> Ai rspace∎Protection.6urfaces4or.6an Carlos Airporty <br /> Subpart C, Obstruction Standards, of Federal Aviation Regulations(FAR)Part 77,Safe, Efficient <br /> Use and Preservation of the Navigable Airspace, establishes the standards for determining <br /> obstructions to air navigation. This subpart defines a set of imaginary surfaces are established <br /> with relation to an airport's runway(s). The slope and dimension of each imaginary surface is <br /> based on the type of approach available or planned for each runway(e.g„visual,non-precision, <br /> precision). The five types of imaginary surfaces for civil airports are: <br /> •f PrimarycSurface—The primary surface is longitudinally centered on a runway and has the <br /> same elevation as the elevation of the nearest point on the runway centerline. When the <br /> runway has a prepared hard surface,the primary surface extends 200 feet beyond each end <br /> of that runway. The width of the primary surface ranges from 250 to 1,000 feet depending <br /> on the existing or planned approach and runway type. The primary surface must be clear of <br /> all obstructions except those fixed by their function, such as runway edge lights, <br /> navigational aids, or airport signage. The majority of the primary surface is controlled by <br /> runway safety area criteria contained in FAA Advisory Circular 150/5300-13,Airport <br /> Design, and almost always lies within airport-controlled property. <br /> • Approach8urface—The approach surface is longitudinally centered on the extended <br /> runway centerline and extends outward and upward from the end of the primary surface. <br /> The slope of the approach surface is based upon the type of approach available or planned <br /> for each runway: 20:1 (visual), 34:1 (non-precision), or 50:1 (precision). The length of the <br /> approach surface varies from 5,000 to 50,000 feet depending on the approach type. <br /> • Transitionak8urface—The transitional surface extends outward and upward at right <br /> angles to the runway centerline and extends at a slope of 7 feet horizontally for each one- <br /> foot vertically(7:1)from the sides of the primary and approach surfaces. The transitional <br /> surfaces extend to the point at which they intercept the horizontal surface at a height of 150 <br /> feet above the established airport elevation(i.e.,highest runway end elevation). <br /> • HorizontakSurface—The horizontal surface is a horizontal plane located 150 feet above <br /> the established airport elevation and encompasses an area from the transitional surface to <br /> the conical surface. <br /> f <br /> • ConicahSurface—The conical surface extends upward and outward from the periphery of <br /> the horizontal surface at a slope of 20 feet horizontally for every one-foot vertically(20:1) <br /> for a horizontal distance of 4,000 feet.Height limits for the surface range from 150 feet <br /> above the airport elevation at the inner edge to 350 feet at the outer edge. <br /> SanfCarlosfAirportV 3-26 ESAfAirportsfl130753f <br /> ALUCPfWhitefPape/ Junef2014f <br />