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* 4/11/78 AC 150/5300-4B CHG 2 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 (5 670 kg) or less gross weight * (except as limited by paragraph 5) into three groups. Figure 2-1 shows the airport ty pe ype to which any specific ai/•plane is related. The physical characteristics of many of these airplanes are contained in Advisory Circular 150/5325-5, Aircraft Data. b. Figures 4-1 and 4-2 present a family of curves for each utility airport type. Knowing the elevation of the site and the mean daily maximum temperature for the hottest month, the runway length recommended for Basic Utility, Stage I or Stage II, or General Utility category can be determined. Examples of the procedure to be followed are shown in Figures 4-1 and 4-2. c. The mean daily maximum temperature for the hottest month of the year may be obtained from the National Oceanic and Atmospheric Administration's (NOAA) local National Weather Service Office, or from the National Oceanic and Atmospheric Administration's publication Climatography of the United States No. 86. (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 Regulations, 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 Section 23.1587, Performance Information) is contained in the individual Airplane Flight Manual. This information is provided to assist the airplane operator in determining the runway length necessary to operate safely. Chap 4 Par 11 Page 11