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operations of an airport. An object is considered an obstruction to <br />a public airport if it is of greater height than any of the following <br />airport imaginery surfaces (illustrated in Figure 1): <br />1. The rp imary surface extends 200' beyond each end of .the hard surfaced <br />runway, making it 3700' long x 500' wide in this case, with the ele- <br />vation of any point on that surface being the same as the elevation <br />of the nearest point on the runway centerline; <br />2. The horizontal surface, at a height of 150 feet above the established <br />airport elevation, the perimeter of which is established by swinging <br />arcs of 6,000 feet radii from the center of each end of the primary <br />surface. of each runway and connecting the adjacent arcs by lines <br />tangent to those arcs; <br />3. The conical surface extends upward and outward from the periphery <br />of the horizontal surface at a slope of 20:1 for a horizontal dis- <br />tance of 4,000 feet as measured radially outward from the periphery <br />of the horizontal surface; <br />4. The approach surface is longitudinally centered on the extended <br />centerline at each end of the runway and it inclines upward and <br />outward at a slope of 40:1 for a horizontal distance of 10,000 <br />feet. The inner edge of the approach surface is the same width <br />and elevation as, and coincides with, the end of the primary <br />surface and it expands uniformly to a width of 3500' at the outer <br />edge; <br />6 <br />