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6/24/75 AC 150/5300-4B <br />c. At some locations, it may be appropriate to determine a runway <br />length of a specific airplane. For example, many owners of <br />multiengine airplanes require that their pilots use the airplane's <br />accelerate -stop distance in determining the length of runway <br />available for takeoff. At locations where this situation occurs, <br />the airport planner should consider the multiengine operator's <br />requirements in determining the runway length to be constructed. <br />15. RUNWAY CAPACITY. <br />a. The capacity of a runway is the number of aircraft operations <br />(an operation is defined as either a landing or takeoff) that the <br />runway can accommodate in a limited period of time. For utility <br />airports, determine the capacity for the peak hour of the week <br />under both visual flying conditions (VFR) and instrument flying <br />conditions (IFR). For VFR, a runway is considered to have reached <br />capacity when delays to departures average 2 minutes during the <br />peak. For IFR, the criterion is a 4-minute delay to either depar- <br />tures or arrivals. <br />b. A method for calculation of capacity values is given in Advisory <br />Circular 150/5060-1, Airport Capacity Criteria Used in Preparing <br />the National Airport Plan. This publication discusses the numerous <br />factors which must be considered in a capacity analysis. <br />c. However, as general guidelines for a single runway serving small <br />airports, the following ranges of capacity can be used: <br />(1) VFR: 75 ops/hr--with minimum taxiway system and 110 ops/hr-- <br />with complete taxiway system. <br />(2) IFR: 4 to 15 ops/hr (nonprecision approach). <br />d. The construction of a parallel runway will usually double the air- <br />port capacity for VFR operations. <br />Chap 4 <br />Par 14 <br />Page 13 <br />