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• 6/24/75 AC 150/5300-4B CHAPTER 7. DESIGN CRITERIA AND DIMENSIONAL STANDARDS 26. GENERAL. The design standards presented here are recommended standards as distinguished from absolute requirements. For example, the absolute requirement for taxiway width is the outside -to -outside dimension of the landing gear configuration. The recommended standard exceeds this since it takes into account the practicalities of airplane operational factors both in daylight and nighttime conditions. Discussion of these and other factors is given in Appendix 1, Variables in Design. Review of Appendix 1 should give the engineer a better understanding of the criteria utilized in the establishment of airport standards. This, in turn, should allow a more comprehensive application of the standards, particularly where a deviation is being considered. 27. FUTURE ROLE CONSIDERATIONS. The recommended dimensional standards for all components of utility airports are given on the following pages. In applying these criteria, the future role of the airport must be determined to the extent feasible. The initial development of the airport should be planned to allow expansion to a higher category. For example, where a Stage II, Basic Utility airport is expected to expand to a General Utility airport, the pavement widths for Stage II should be used in conjunction with the lateral clearances of General Utility. Specifically, the runway and taxiway widths would be 60 feet and 30 feet, but with a runway to taxiway separation of 200 feet (rather than 150 feet). If the ultimate development plans include expansion of the airport to accommodate basic or general transport airplanes, the design criteria contained in Advisory Circular 150/5300-6 should be considered. 28. DIMENSIONAL CRITERIA. Figure 7-1 specifies recommended widths, minimum clearances, and other dimensional criteria. One set of dimensions is tabulated for each type of utility airport assuming the attainment of 95-percent coverage for 10.5-knot crosswind component. For airports with runway wind coverage of less than 95 percent, a crosswind runway may be needed (see Chapter 3), or an increase in landing area may be considered (see Appendix 1). Where student flying is significant and less than 95 percent wind coverage is attained, consider a 75-foot-wide runway and a 200-foot runway safety areas for Basic Utility airports. 29. TYPICAL AIRPORT LAYOUT. Figure 7-2 illustrates the application of the dimensional standards and is keyed to the items in Figure 7-1. This typical layout of a portion of an airport shows the relation- ship between the runway, taxiway, property line, and obstacle removal. Chap 7 Par 26 Page 29