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6/24/75 AC 150/5300-4B <br />operations. Generally, the area should be large enough to accom- <br />modate two airplanes in front of the terminal building. Also, <br />investigate requirements for possible local air mail service. <br />b. At Basic Utility airports, a gas pump facility is usually the most <br />economical method of airplane fueling. For such an operation, <br />locate the fueling area near the terminal building. Application <br />of a fuel -resistant seal coat to the pavement may be desirable in <br />these areas. <br />c. At General Utility airports, a fuel truck operation is sometimes <br />used. Such an operation eliminates the need for gas pump areas <br />and allows more area for airplane parking. <br />d. In summary, carefully design the apron to maintain its flexibility <br />and expandability. Use empirical relationships for design only when <br />field data are not available. Install the tiedowns so that the <br />apron area can be altered as needed. Also, it is ideal to keep <br />both ends of the apron free of structures and thus to allow for <br />future expansion. <br />Chap 9 <br />Par 44 <br />Page 47 <br />