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AC 150/5300-4B 6/24/75 f. Assume that a certain portion of the itinerant airplanes will be on the apron during the busy day. Fifty percent is considered a rea- sonable figure, but if used, it must be applied with caution. g. Calculate the area needed on the basis of 360 square yards per itin- erant airplane. h. Increase the above by a specific percentage to accommodate expansion for at least the next 2-year period. A minimum increase of 10 per- cent is suggested. 42. APRON FOR BASED AIRPLANES. Locate the apron for based airplanes in an area separate from the itinerant airplanes. The area needed for parking based airplanes is smaller per airplane than for itinerants. This is due to knowledge of the specific type of based airplanes and closer clearance allowed between airplanes. In determining the total apron area required for local airplanes, consider the following factors: a. The total number of based airplanes. b. The number of airplanes now hangared or expected to be hangared within two years. c. The number of airplane owners who will continue to tie down their airplane in a turfed (unpaved) area. At many general aviation airports a certain percentage of airplane owners will prefer to tie down in the most inexpensive area. d. An area of 300 square yards per airplane. This should be adequate for all single engine and light twin engine airplanes, such as the Cessna 310, which has a wingspan of 37 feet and a length of 27 feet. e. An increase in total area to accommodate expansion for at least the next 2-year period. A minimum increase of 10 percent is suggested. 43. TIEDOFNS. Using the above, a total apron area needed for based air- planes can be computed. The location of tiedowns in this area will vary with local preference. However, the purpose for laying out the tiedowns is to park the maximum number of airplanes and to maintain ease of ingress and egress. Figure 9-3 illustrates two layouts of such tiedowns for small airplanes. Information on general tiedown techniques and procedures is given in Advisory Circular 20-35, Tie -down Sense. 44. OTHER CONSIDERATIONS. a. As activity at the airport increases, the demand for an area to load and unload airplanes will increase. This activity may be in the form of charter, air taxi, business, or personal airplane Page 46 Chap 9 Par 41 •