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6/24/75 AC 150/5300-4B <br />CHAPTER 9. AIRPLANE PARKING AND TIEDOWN <br />40. GENERAL. During the airport master planning study, determine the <br />number of based and transient airplanes expected to utilize the airport. <br />Using these figures, the layout and design of the airplane parking <br />apron and tiedown area can be accomplished. <br />a. Figure 9-1 shows an example of the design of a parking apron for <br />small airplanes related to operation functions. There are five <br />elements that should be considered: the fixed base operator <br />(FBO), the itinerant airplanes, the based airplanes, short-term <br />loading and unloading (terminal), and fueling. <br />b. The FBO will require space adjacent to his facility to park his <br />own airplanes being serviced. Room must be provided for future <br />expansion. <br />41. ITINERANT APRON. Provide parking facilities for itinerant or transient <br />airplanes which give easy access to the terminal facilities, fueling, <br />and surface transportation. It is difficult to determine the total <br />amount of apron area needed to accommodate itinerant airplanes by <br />formula or empirical relationship. Local conditions often vary signi- <br />cantly from one airport to another. The ideal solution is to conduct <br />an on -site survey during typical busy days and to count the itinerant <br />airplanes on the ground periodically during the day. However, this is <br />impossible for new airports and impractical for many airports that <br />have no manager. Recognizing this situation, it is worthwhile to state <br />a method which includes factors that affect the determination of the <br />area needed for itinerant parking. With this method, the engineer/ <br />planner can analyze and estimate the demand for the itinerant airplane <br />apron. The suggested method is as follows: <br />a. Calculate the total annual itinerant operations from the best <br />available source. This may be as described in Figure 9-2. <br />b. Obtain the record of aviation gas sales for the year for the <br />airport. <br />c. Correlate gas sales with annual itinerant operations on a monthly <br />basis. <br />d. Calculate the average daily itinerant operations for the most <br />active month. <br />e. Assume the busy itinerant day is 10 percent more active than <br />the average day. This is based on data from FAA surveys. <br />Chap 9. <br />Par 40 <br />Page 45 <br />