AG 1994 01 18 - Laserfiche WebLink

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We recommend that you reference FAA Advisory Circular 150/5300- 13, "Airport Design," to establish an acceptable level of safety. Federal Aviation Regulations, Part 77 and Advisory Circular 150/5300-13, define certain imaginary surfaces around runways which should be maintained clear of obstructions. Of prime importance, the runway approaches should have a 20:1 approach surface that is clear of all obstructions. The ends of the runway should be a minimum of 500 feet from nearby roads, so that a minimum clearance of 15 feet may be obtained between the roadway surface and the 20:1 approach surface to the runway. In addition, the centerline of the runway should be located at least 250 feet from nearby roads, so that a minimum clearance of 15 feet may be obtained between the road surface and a 7:1 transitional surface for the runway. If the roadway elevation is higher than the runway elevation, these minimum distances should be increased to provide the 15-foot vertical clearance above the roadway surface. If there are obstructions that penetrate a clear 20:1 approach slope surface that cannot be removed/lowered, we recommend that the runway threshold be displaced, and appropriately marked, so as to provide clear 20:1 approaches to each runway threshold. A general ordinance of the State of North Carolina provides that certain airport obstructions or alterations require a written permit prior to construction. The permit may be obtained from the North Carolina Department of Transportation. Should you have any questions desire technical assistance in service is available to you, concerning the above action or airport matters, our advisory Sincerely, Juanita D. Smith Program Specialist Enclosure: FAA Form 5010-5 CC: Federal Highway Administration, w/cy 7480-1 & sketch NC/DOT, w/cy 7480-1 & sketch