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area. In either case, there should be a substantial usage or poten- <br />ti al usage by airplanes having a gross weight of over 8,000 pounds. <br />Examples of airplane models accommodated by each airport type are shown <br />in Table I (next page). These aircraft include some turboprop, but no <br />pure jet airplanes. <br />B. Runway and Site Requirements <br />Based on an approximate airport elevation of 876 feet above sea level and <br />a normal maximum temperature of 87°F on the hottest month of the year, <br />the minimum length of the primary runway for a Basic Utility - Stage II <br />airport is 3300 feet. The runway shall have a minimum paved surface <br />width of 60 feet. The longitudinal gradient on any part of the runway <br />shall not exceed 2% and the transverse gradient shall not exceed 2%. <br />Buildings and structures on a Basic Utility - Stage II airport with a <br />non-precision instrument approach shall not be closer than 500 feet to <br />the centerline of the runway. Adequate fencing or barriers shall be <br />constructed to prevent all persons not engaged in flight activities <br />from having access to a position of danger with relation to aircraft <br />in .the vicinity of the building areas and on the flight line. Aircraft <br />tie down facilities must be furnished for at least three more aircraft <br />than regularly use the facilities. <br />The landing strips or areas shall be outlined with effective markers <br />which shall be constructed and installed in an approved manner. All <br />public airports shall be equipped with a 3'x12' blaze orange colored <br />4 <br />