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AC 150/5300-45 CHG 2 * 4/11/78 b. Performance information from Airplane Flight Manuals was selectively grouped and used to develop the runway length curves in Figures 4-1 and 4-2. The major parameters utilized for the development of these curves were the landing and takeoff distances for Figure 4-1 and the landing, takeoff, and accelerate -stop distances for Figure 4-2. The following conditions were used in developing the curves: (1) (2) (3) Zero headwind component. Maximum certificated takeoff and landing weights. Optimum flap setting for the shortest runway length (normal operation). c. Airport elevation and temperature were left variable. Other factors, 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 runway 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 temperature. * 14. OTHER CONSIDERATIONS. In most cases, Figure 4-1 or 4-2 should be used for determining the runway length at a utility airport. However, the airport planner should consider the following conditions which could have an effect on the runway length for a particular airport. a. Although the curves present runway lengths for elevations up to 9,000 feet (2 743 m),some of the airplanes listed in the example grouping 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. FAR Part 135 imposes the following operational requirements on operations conducted under this part. Page 12 Airplanes having a seating configuration of 10 passenger seats or more must consider the accelerate -stop distance in computing the required runway length. The operators of airplanes type certificated prior to July 19, 1970, and having a seating configuration of 10 passenger seats or more are permitted to utilize an overrun distance equal to that required to stop the airplane from a ground speed of 35 knots (40 miles per hour) in computing their accelerate -stop distance. This provision of FAR Part 135 may be accommodated by providing a full 200-foot (60 m) runway safety area beyond the runway end. Chap 4 Par 13