FAA Regulations - Laserfiche WebLink

Home

AC 150/5300-4B CHG 3 12/5/78 d. Displaced Runway Approach Threshold. A threshold that is located at a point on the runway other than at the beginning of the full strength pavement. The paved area behind the displaced runway approach threshold is available for the landing roll -out or takeoff of aircraft. e. Hazard to Air Navigation. Any obstruction to air navigation that an FAA aeronautical study has determined to be a hazard to air naviga- tion, An obstruction to air navigation is presumed to be a hazard to air navigation unless an FAA aeronautical study determines otherwise. (See paragraph 16f for further discussion.) f. Nonprecision Instrument Runway. A runway having an existing instru- ment approach procedure utilizing air navigation facilities with only horizontal guidance, or area type navigation equipment, for which a straight -in nonprecision instrument approach procedure has been approved, or planned, and for which no precision approach facilities are planned, or. indicated on an FAA planning document or military service military airport planning document. g. Obstacle. Any fixed, whether temporary or permanent, or mobile object, or part thereof, that is located on an area intended for the surface'movement of aircraft, that extends above a defined. surface intended to protect aircraft in flight, that interferes with the siting or operation of navigation aids, or that may control the establishment of instrument procedures. h. .Obstruction to Air Navigation. Any object that is of greater height than any of the heights defined in FAR 77.23. An obstruction to air navigation is presumed to be a hazard to air navigation unless an FAA aeronautical study determines otherwise. (See paragraph 16£ for further discussion.) i. Precision Instrument Runway. A runway having an existing instrument approach procedure utilizing an instrument landing system (ILS), or a precision approach radar (PAR). It also means a runway for which a precision approach system is planned and is so indicated by an FAA approved airport layout plan; a military service approved military airport layout plan; any other FAA planning document, or military service military airport planning document. Primary 'Surface. A surface longitudinally centered on a runway. When the runway has a specially prepared hard surface, the primary surface extends 200 feet (60 m) beyond each end of that runway; but when the runway has no specially prepared hard surface, or planned hard surface, the primary surface ends at each end of that runway. The elevation of any point on the primary surface is the same as the elevation of the nearest point on the runway, centerline. The width of a primary surface is: j• Page 2 Chap 1 Par 3 •