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I I I I I I I I I I I I I I i I I e. 250 feet for (Designate all other existing or planned visual utility runways.) 2. HORIZONTAL ZONE: All that land which lies directly under an imaginary horizontal surface 150 feet above the established airport elevation, or a height of feet above mean sea level, the perimeter of which is constructed by.swinging arcs of specified radii from the center of each end of the primary surface of each runway and connecting the adjacent arcs by lines tangent to those arcs. The radius of each arc is: a. 10,000 feet for (Designate all existing or planned p~ecision instrument runways and non-precision instrument runways having visibility minimums as low as three- fourths of a statute mile.) b. 6,000 feet for (Designate all other existing or planned runways.) When a 6,000 foot arc is encompassed by tangents connecting two adjacent 10,000 foot arcs, the 6,000 foot arc shall be disregarded in the con- struction of the perimeter of the horizontal surface. 3. CONICAL ZONE: Ail that land which lies directly under an imaginary conical surface extending upward and outward from the periphery of the horizontal surface at a slope of 20 to 1 for a horizontal distance of 4,000 feet as measured radially outward from the periphery of the horizontal surface. 4. APPROACH ZONE: Ail that land which lies directly under an imaginary approach surface longitudinally centered on the extended centerline at each end of a runway. The inner edge of the approach surface is at the s~me width and elevation as, and coincides with, the end of the primary surface. The approacl~ surface inclines upward and outward at a slope of: -7-