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AC 150/5300-4B 6/24/75 b. Performance information from Airplane Flight Manuals was selectively grouped and used to develop the curves in Figure 4-1. The major parameters utilized for the development of the runway length curves were the landing and takeoff distances. As these distances vary with environmental considerations, the following conditions were found to be representative and were used in developing curves: (1) Zero headwind component. (2) Maximum weight for takeoff and landing. (3) Optimum flap setting for shortest runway length (normal operation). (4) Airport elevation equal to pressure altitude. c. Airport elevation and temperature were left variable. Other fac- tors, such as relative humidity and runway gradient, also have a variable effect on runway length but are not accounted for in certification. These other factors were accounted for in the run- way length curves by increasing the takeoff or landing distance (whichever was longer) of the group's most demanding airplane by 10 percent for the various combinations of elevation and tempera- ture. 14. OTHER CONSIDERATIONS. In most cases, Figure 4-1 should be used for determining the runway length at a utility airport. However, the air- port planner should be aware of other parameters that may influence his determination of the runway length for a particular airport. These other parameters should be evaluated to determine if they would have any effect on the runway lengths obtained from Figure 4-1. a. Although the curves present runway lengths for elevations up to 9,000 feet, some of the airplanes listed in the example groupings in Figure 2-1 are not capable of operating at high altitudes without modification. Therefore, special care must be exercised in adaptation of these curves to the critical airplane or group of airplanes for operations at higher elevations. b. The runway length requirements for utility airplanes with the capability to carry more than ten passengers and intended for use by air taxi and/or commercial operations were not considered in the development of the curves. If the runway is being designed to accommodate these types of operations, the air taxi/commercial operations (FAR Part 135) section of the particular Airplane Flight Manual should be consulted to determine the necessary length of runway. Page 12 Chap 4 Par 13 •