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6/24/75 AC 150/5300-4B • CHAPTER 4. RUNWAY LENGTH REQUIREMENTS AND CAPACITY 11. PRIMARY RUNWAY LENGTH. a. As discussed previously, the concept of utility airports categorizes all airplanes of 12,500 pounds or less gross weight (excluding jet airplanes) into three groups. Figure 2-1 shows the airport type to which any specific airplane is related. The physical characteristics of many of these airplanes are contained in Advisory Circular 150/5325-5, Aircraft Data. b. Figure 4-1, Runway Length Curves, presents a family of curves for each utility airport type. Knowing the elevation of the site and the normal maximum temperature of the hottest month, the runway length recommended for Basic Utility, Stage I or Stage II, or General Utility category can be determined. An example of the pro- cedure to be followed is shown in Figure 4-1. c. The normal maximum temperature of the hottest month of the year may be obtained from the National Oceanic and Atmospheric Administra- tion's (NOAA) local National Weather Service Office, or from Technical Paper No. 81, "Climatography of the United States pub- lished by the U.S. Department of Commerce, NOAA. The normal max- imum temperature is the arithmetical average of the daily highest temperature during the hottest month (see Appendix 3). 12. CROSSWIND RUNWAY LENGTH. a. At some airport sites, it may not be feasible to obtain 95-percent wind coverage with one runway for a 10.5-knot or 12-mph crosswind component. In such cases, it may be determined that the benefits from a crosswind (or secondary) runway will justify its construction. b. Accordingly, the question arises as to the length of the crosswind runway. The crosswind runway should be at least 80 percent of the length required for the primary runway. This will accommodate the average small airplane for both landing and takeoff when the cross- wind component of the primary runway exceeds 10.5 knots or 12 mph. 13. DEVELOPMENT OF RUNWAY LENGTH CURVES. a. Federal Aviation Regulation Part 23, Airworthiness Standards: Normal, Utility, and Acrobatic Category Airplanes, prescribes air- worthiness standards for the issuance of small -airplane type certificates. The performance information for each airplane (defined in Section 23.51, Takeoff; Section 23.75, Landing; and Sec- tion 23.1587, Performance Information) is contained in the individ- ual Airplane Flight Manual. This information is provided to assist the airplane operator in his determination of runway length requirements. Chap 4 Par 11 Page 11