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AC 150/5300-4B CHG 2 4/11/78 <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, 8-3, and 8-4 show three types of turnarounds. Other <br />designs may also be effective, as long as sufficient space is provided <br />for the airplanes beyond the holding line. Drainage, snow removal, and <br />construction costs should be considered in selecting a design configura- <br />tion. For example, the pavement required to build the turnarounds <br />shown in Figures 8-2 and 8-3 would provide a portion of a parallel <br />taxiway. At a specific airport, a moderate increase in cost may allow <br />construction of a partial parallel taxiway rather than the turnaround. <br />39. HOLDING APRONS. The purpose of a holding apron is to provide an area <br />clear of taxiway traffic for aircraft to park while the "before -takeoff - <br />checklist" is performed. The construction of a holding apron will <br />minimize delays to departing aircraft by providing taxiway bypass <br />capability. When runway activity is forecast to reach 30 operations <br />per peak hour (see paragraph 48, Airport Survey, for peak -hour deter- <br />mination), plans should be made for developing a holding apron. Figures <br />8-2, 8-3, and 8-5 show typical layouts for holding aprons at utility <br />airports. a <br />Page 40 <br />Chap 8 <br />Par 38 <br />