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12/5/78 AC 150/5300-10 CHG 3 <br />(1) 250 feet (75 m) for utility runways having only visual <br />approaches. <br />(2) 500 feet (150 m) for utility runways having nonprecision <br />instrument approaches. <br />(3) <br />For other than utility runways the width is: <br />(a) 500 feet (150 m) for visual runways having only <br />visual approaches. <br />(b) 500 feet (150 m) for nonprecision instrument runways <br />having visibility minimums greater than three -fourths <br />statue mile. <br />(c) 1,000 feet (300 m) for a nonprecision instrument runway <br />having a nonprecision instrument approach with visibility <br />minimums as low as three -fourths of a statute mile, and <br />for precision instrument runways. <br />The.widthof the primary surface of a runway is the width prescribed <br />for the most precise approach existing or planned for either end of <br />that runway. <br />k. Relocated Runway Approach Threshold. A threshold that is located at <br />a point on the runway other than at the beginning of the full strength <br />pavement. The paved area behind the relocated runway approach <br />threshold is no longer available for the landing or takeoff run of <br />aircraft. <br />1. Runway. A defined area on an airport prepared for the landing and <br />takeoff of aircraft. <br />m. Runway Approach Threshold. The designated beginning of the runway <br />that is available and suitable for the landing of airplanes. <br />n. Runway Clear Zone. An area at ground level that begins at the end <br />of each primary surface defined in FAR 77.25(c) and extends with the <br />width of each approach surface defined in FAR 77.25(d), to terminate <br />directly below each approach surface slope at the point, or points, <br />where the slope reaches a height of 50 feet (15 m) above the eleva- <br />tion of the runway end or 50 feet (15 m) above the terrain at the <br />outer extremity of the clear zone, whichever distance is shorter. <br />(See Appendix 6 for runway clear zone dimensions.) <br />o. Runway Safety Area. A rectangular area, symmetrical about the <br />runway centerline, which includes the runway structural pavement, <br />shoulders, and stopway (if present). The portion abutting the <br />edge of the shoulders is cleared, drained, graded, and usually <br />Chap 1 <br />Par 3 <br />Page 2-1 <br />