The following words and phrases when used in this article shall have the meaning given to them in this section unless the context clearly indicates otherwise:
(a) Airport Elevation: The highest point of an airport’s useable landing area measured in feet above sea level. The airport elevation of the Inter County Airport is Eleven Hundred Fifty-Two Feet (1152 feet) above sea level. The elevation of the Allegheny County Airport is 1250 feet above mean sea level.
(b) Airport Hazard: Any structure or object, natural or manmade, or use of land which obstructs the airspace required for flight or aircraft in landing or taking off at an airport or is otherwise hazardous as defined in 14 CFR Part 77 and 74 Pa. Cons. Stat. §5102.
(c) Airport Hazard Area: Any area of land or water upon which an airport hazard might be established if not prevented as provided for in this article and the Act 164 of 1984 (Pennsylvania Laws Relating to Aviation).
(d) Approach Surface (Zone): An imaginary surface longitudinally centered on the extended runway centerline and extending outward and upward from each end of the primary surface. An approach surface is applied to each end of the runway based on the planned approach. The inner edge of the approach surface is the same width as the primary surface and expands uniformly depending on the planned approach. The approach surface zone, as shown on Figure 1 is derived from the approach surface.
(e) Conical Surface (Zone): An imaginary surface extending outward and upward from the periphery of the horizontal surface at a slope of twenty (20) feet horizontally to one (1) foot vertically for a horizontal distance of 4,000 feet. The conical surface zone, as shown on Figure 1 is based on the conical surface.
(f) Department: Pennsylvania Department of Transportation.
(g) FAA: Federal Aviation Administration of the United States Department of Transportation.
(h) Height: For the purpose of determining the height limits in all zones set forth in this article and shown on the zoning map, the datum shall mean sea level elevation unless otherwise specified.
(i) Horizontal Surface (Zone): An imaginary plane 150 feet above the established airport elevation that is constructed by swinging arcs of various radii from the center of the end of the primary surface and then connecting the adjacent arc by tangent lines. The radius of each arc is based on the planned approach. The horizontal surface zone, as shown on Figure 1, is derived from the horizontal surface.
(j) Larger Than Utility Runway: A runway that is constructed for and intended to be used by propeller driven aircraft of greater than 12,500 pounds maximum gross weight and jet powered aircraft.
(k) Nonconforming Use: Any pre-existing structure, object of natural growth, or use. of land which is inconsistent with the provisions of this article or an amendment thereto.
(l) Non-Precision Instrument Runway: A runway having an existing instrument 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.
(m) Obstruction: Any structure, growth, or other object including a mobile object, which exceeds a limiting height set forth by this article.
(n) Precision Instrument Runway: A runway having an existing instrument approach procedure utilizing an Instrument Landing System (ILS) or a Precisions Approach Radar (PAR). It also means a runway for which a precision approach system is planned and is so indicated on an approved airport layout plan or any other planning document.
(o) Primary Surface (Zone): An imaginary surface longitudinally centered on the runway, extending 200 feet beyond the end of paved runways or ending at each end of turf runways. The elevation of any point on the primary surface is the same as the elevation of the nearest point on the runway centerline. The primary surface zone, as shown on Figure 1, is derived from the primary surface.
(p) Runway: A defined area of an airport prepared for landing and takeoff of aircraft along its length.
(q) Structure: An object, including a mobile object construct or installed by man, including but without limitation, buildings, towers, cranes, smokestacks, earth formation and overhead transmission lines.
(r) Transitional Surface (Zone): An imaginary surface that extends outward and upward from the edge of the primary surface to the horizontal surface at a slope of seven (7) feet horizontally to one (1) foot vertically (7:1). The transitional surface zone, as shown on Figure 1, is derived from the transitional surface.
(s) Tree: Any object of natural growth.
(t) Utility Runway: A runway that is constructed for and intended to be used by propeller driven aircraft of 12,500 pounds maximum gross weight or less.
(u) Visual Runway: A runway intended solely for the operation of aircraft using visual approach procedures.
(Ord. 3622. Passed 11-21-11.)
(Ord. 3622. Passed 11-21-11.)