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AC 150/5300-46 CHG 1 8/24/76 <br />*38. TURNAROUNDS. Turnarounds should be considered during the initial <br />runway development as an alternative to a full or partial parallel <br />taxiway at low activity airports. The construction of a turnaround <br />will significantly improve the airport's safety and efficiency. <br />Figures 8-2 and 8-3 show two types of turnarounds. Other designs <br />may also be effective, as long as sufficient space is provided for <br />the airplanes beyond the holding line. Drainage, snow removal, and <br />construction costs should be considered in the selection of a design <br />configuration. For example, the pavement required to build the <br />circular turnaround shown in Figure 8-3 would provide a significant <br />portion of a parallel taxiway. At a specific airport, a slight <br />increase in cost may allow construction of a partial parallel taxiway <br />rather than the circular turnaround. <br />*39. HOLDING APRONS. The purpose of a holding apron is to minimize delay <br />to departing airplanes. When activity is forecast to reach 30 total <br />operations per normal peak hour, plans should be made for a holding <br />apron. Figure 8-4 shows a typical layout of a holding apron at a <br />utility airport. <br />Page 40 <br />Chap 8 <br />Par 38 <br />* <br />