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53 <br /> No structure or obstruction will be <br /> permitted within the primary zone, that is not part of the landing <br /> and take-off facilities and is of greater height than the nearest <br /> point on the runway centerline . <br /> B . Horizontal Zone - The area around the <br /> City of Zephyrhills Airport with an outer boundary the perimeter of <br /> which is constructed by swinging arcs of specifie&radii from the <br /> center of each end of the primary zone of each airport ' s runway and <br /> connecting the adjacent arcs by lines tangent to those arcs . The <br /> radius of each arc is : <br /> CO (1) Runways 18 , 36 , 14, 32 and 22 ; <br /> CO 5 , 000 feet for all runways desig- <br /> nated as utility or visual ; <br /> O <br /> scr (2) Runway 4; <br /> 10 ,000 feet for all other runways . <br /> The radius of the arc specified for each end of a runway will have <br /> the same arithmetical value . That value will be the highest com- <br /> posite value determined for either end of the runway. When a <br /> 5 , 000-foot arc is encompassed by tangents connecting two adjacent <br /> 10 , 000-foot arcs , the 5 , 000-foot arc shall be disregarded on the <br /> construction of the perimeter of the horizontal zone . No structure <br /> or obstruction will be permitted in the horizontal zone that has a <br /> height greater than 150 feet above the airport height . <br /> C . Conical Zone - The area extending <br /> outward from the periphery of the horizontal zone for a distance <br /> of 4, 000 feet. Height limitations for structures in the conical <br /> zone are 150 feet above airport height at the inner boundary with <br /> permitted height- increasing one foot vertically for every 20 feet <br /> of horizontal distance measured outward from the inner boundary to <br /> a height of 350 feet above airport height at the outer boundary. <br /> D. Approach Zone - An area longitudinally <br /> centered on the extended runway centerline and extending outward <br /> from each end of the primary surface . An approach zone is desig- <br /> nated for each runway based upon the type of approach available or <br /> planned for that runway end. <br /> 011128" X559 <br />