V.I. Code tit. 6, § 73 (2019)
2019 US Virgin Islands Code|Title 6 - Aeronautics|Chapter 7 - Airport Zoning in St. Thomas|§ 73. Definitions

 As used in this chapter, unless the context otherwise requires: (a) “Airport” means the Harry S. Truman Airport. (b) “Airport elevation” is 24 feet above mean sea level. (c) “Approach surface” means 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 set forth in section 75 of this chapter. In plan, the perimeter of the approach surface coincides with the perimeter of the approach zone. (d) “Approach, transition, horizontal and conical zones” means those zones set forth in section 74 of this chapter. (e) “Board” means the Board of Land Use Appeals as defined in section 135 of Title 3, Virgin Islands Code, and section 236 of Title 29, Virgin Islands Code. (f) “Conical surface” means a surface extending outward and upward from the periphery of the horizontal surface at a slope of 20 to 1 for a horizontal distance of 4,000 feet. (g) “Hazard to air navigation” means an obstruction determined to have a substantial adverse effect on the safe and efficient utilization of the navigable airspace. (h) “Height”: for the purpose of determining the height limits in all zones set forth in this chapter and shown on the zoning map, the datum shall be mean sea level unless otherwise specified. (i) “Horizontal surface” means a horizontal plane 150 feet above the established airport elevation, the perimeter of which in plan coincides with the perimeter of the horizontal zone. (j) “Larger than utility runway” means 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” means any pre-existing structure, object of natural growth, or use of land which is inconsistent with the provisions of this chapter or an amendment thereto. (l) “Nonprecision instrument runway” means 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” means any structure, growth or other object, including a mobile object, which exceeds a limiting height set forth in section 75 of this chapter. (n) “Person” means an individual, firm, partnership, corporation, company, association, joint stock association, government, quasi-governmental agency, or other entity, including a trustee, a receiver, or assignee, or a similar representative of any of them. (o) “Primary surface” means a surface longitudinally centered on a runway. When the runway has a specially prepared hard surface, the primary surface extends 200 feet beyond each end of the runway. The width of the primary surface is 500 feet. The elevation of any point on the primary surface is the same as the elevation of the nearest point on the runway centerline. (p) “Runway” means a defined area on the airport prepared for landing and takeoff of aircraft along its length. (q) “Structure” means an object, including a mobile object, constructed or installed by man, including but without limitation, buildings, towers, cranes, smokestacks, earth formations, and overhead transmission lines. (r) “Transitional surfaces” means surfaces extending outward at 90 degree angles to the runway centerline and the runway centerline extended at a slope of seven (7) feet horizontally for each foot vertically from the sides of the primary and approach surfaces to where they intersect the horizontal and conical surfaces. Transitional surfaces for those portions of the precision approach surfaces, which project through and beyond the limits of the conical surfaces, extend a distance of 5,000 feet measured horizontally from the edge of the approach surface and at 90 degree angles to the extended runway centerline. (s) “Tree” means any object of natural growth. (t) “Visual runway” means a runway intended solely for the operation of aircraft using visual approach procedures. (u) “Zoning Administrator” means the Zoning Administrator as defined in subsection (a) of section 235, Title 29, Virgin Islands Code.