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<br />' of the airport, or otherwise endangers the landing, taking off, or <br />' maneuvering of aircraft. <br />' F. Wind Analvsis and Runway Orientation Requirements <br />The configuration or layout of an airport is determined by the number and <br />orientation of the runways. Among the primary factors influencing runway <br />' orientation are the direction and velocity of the wind. Wind conditions <br />affect all airplanes to some degree, but generally, smaller aircraft <br />are affected the most. <br />The most desirable runway orientation, based on wind, is the one which <br />has the largest wind coverage and minimum crosswind components. Wind <br />coverage is that percent of time for which operations can be conducted <br />on a runway without exceeding a specified crosswind component. The. <br />desirable wind coverage for an airport is to achieve a wind with less <br />than 10.5 knot or 12 MPH crosswind component 95 percent of the time <br />based on the total hours of weather observations. <br />In those cases where it is not possible or feasible to attain a 95% <br />wind coverage with a single runway for a 10.5 knot or 12 MPH crosswind <br />component, it may be determined that the benefits from a crosswind or <br />.secondary runway will justify its construction. The crosswind runway <br />should be at least 80% of the length required for the primary runway or <br />a minimum length of 2640 feet in this instance. This length should <br />accommodate the average small airplane for both landing and takeoff <br />when the crosswind component of the primary runway exceeds 10.5 knots <br />or 12 MPH. <br />11 <br />