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In this case the runway must be at least 3700 feet long including 200 <br />foot thresholds on each end. The Clear Zone must extend 2000 L.F. <br />out from the ends of the runway at an expanding horizontal slope of <br />20/3. The primary surface area that encompasses the runway, must be <br />500 feet wide for length of the runway. <br />At each end point of the runway the approach surface will extend out <br />at a rate of 20/3 until at the end of the clear zone its width is <br />1100 feet. <br />The approach slope or path necessary for landing is at a ratio of <br />40:1 from the end of each runway extended outward and upward. <br />Therefore, the runway and Clear Zones must have a minimum of 7700 <br />linear feet to meet the requirements, a width of 1100 feet at the <br />end of each Clear Zone and a width of 500 feet at the runway. <br />Obstructions are also a necessary consideration. There can be no <br />obstruction permanent or otherwise in the primary zone. The Clear <br />Zone must have no obstruction within it that extends above the 40:1 <br />approach slope. -The Clear Zone must also be devoid of active use, <br />i. e. residences or activities that may in any way jeopardize the <br />safe approach of any aircraft. <br />In the case of this facility, the railroad and power lines on the south <br />approach determine the location of the south end of the runway. A <br />railroad must be cleared by 17 feet as does any county road. Higher <br />clearance limits are set for four land highways. Power lines must be <br />buried within the Clear Zone. <br />-5- <br />