§ 162.05  DEFINITIONS AND WORD INTERPRETATION.
   For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
   AIRPORT.  Jefferson / Ashe County Airport.
   AIRPORT ELEVATION. The highest point of an airport's useable landing area measured in feet above mean sea level. The Jefferson / Ashe County Airport elevation equals 3183 MSL.
   APPROACH SURFACE.  A surface longitudinally centered on the extended runway centerline, extending outward and upward from the end of the primary surface and at the same slope as the approach zone height limitation slope as set forth in Chapter Four, Airport Height Overlay District.
   CONICAL SURFACE.  A surface extending outward and upward from the periphery of the horizontal surface at a slope of 20:1 for a horizontal distance of 4,000 feet.
   CONICAL ZONE.  A conical zone is established on the area that commences at the periphery of the horizontal zone and extends outward therefrom for a distance of 4,000 feet.
   HAZARD TO NAVIGATION.  An obstruction determined to have a substantial adverse effect on the safety and efficient utilization of the navigable airspace.
   HEIGHT.  For the purpose of determining the height limits in the airport height restrictive area, the datum shall be mean sea level elevation unless otherwise specified.
   HORIZONTAL SURFACE. A horizontal plane 150 feet above the established airport elevation, the perimeter of which in plan coincided with the perimeter of the horizontal zone.
   HORIZONTAL ZONE. The horizontal zone is established by swinging arcs of 5,000 feet radii from the center of the end of the primary surface of the runway and connecting the adjacent arcs by drawing lines tangent to those arcs. The horizontal zone does not include the approach and transitional zones.
   MSL. Mean Sea Level.
   NONCONFORMING USE. Any pre-existing structure, object of natural growth, or use of land which is inconsistent with the provisions of the chapter or amendment thereto.
   NON-PRECISION APPROACH ZONE.  The inner edge of this approach zone coincides with the width of the primary surface and is 500 feet wide. The approach zone expands outward uniformly to a width of 3,500 feet, at a horizontal distance of 10,000 feet from the primary surface. Its centerline is the continuation of the centerline of the runway.
   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 non-precision instrument approach procedure has been planned or approved.
   OBSTRUCTION. Any structure, growth or other object, including a mobile object, which exceeds a limited height set forth in § 162.06.
   PERSON. An individual, firm, partnership, corporation, company, association, joint stock association, or governmental entity; includes a trustee, a receiver, an assignee, or a similar representative of any of them.
   PRIMARY SURFACE. A surface longitudinally centered on a runway. The primary surface extends 200 feet beyond 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 the primary surface is 500 feet.
   RUNWAY. A defined area on an airport prepared for landing and takeoff of aircraft along its length.
   STRUCTURE. An object, including a mobile object, constructed or installed by man, including but not limited to: buildings, towers, cranes, smokestacks, earth formation, and overhead transmission lines.
   TRANSITION SURFACES. These surfaces extend outward at right angles (90 degree angles) to the runway centerline and extend at a slope of seven feet horizontally for each one foot vertically from the sides of the primary and approach surfaces to where they intersect the horizontal and conical surfaces.
   TRANSITIONAL ZONES. The transitional zones are the area beneath the transitional surfaces.
   TREE. Any object of natural growth.
   VISUAL APPROACH ZONE. The inner edge approach zone coincides with the width of the primary surface and is 500 feet wide. The approach zone expands outward uniformly to a width of 2,000 feet at a horizontal distance of 5,000 feet from the primary surface. Its centerline is the continuation of the centerline of the runway.
   VISUAL RUNWAY. A runway intended solely for the operation of aircraft using visual approach procedures.
(Ord. passed 6-17-02)