(A) Airspace zones. In order to carry out the purpose of this chapter, as set forth above, the following airspace zones are hereby established: Primary Zone, Horizontal Zone, Conical Zone, Approach Zone, and Transitional Zone, and whose locations and dimensions are as follows:
(1) Primary Zone. All that land which lies directly under an imaginary primary surface that coincides in size and shape with the designated FATO. The elevation of any point on the primary surface is the same as the elevation of the lowest point on the TLOF.
(2) Approach Zone. All that land which lies directly under an imaginary approach surface. The approach surface may be defined by a single magnetic direction from the center of the heliport or as an arc from the center of the heliport. The inner edge of the approach surface starts at the elevation of the primary surface, at the end of the primary surface and extends a distance equal to half of the FATO width on either side of the defining direction or arc. The approach surface inclines upward at a slope of 8:1 and expands uniformly to a width of 250 feet on either side of the defining direction or arc at a distance of 4,000 feet from the primary surface. The approach surface may be curved and if curved, the curve may not start until 300 feet from the primary surface and the minimum turning radius must be at least 886 feet.
(3) Transitional Zone. All that land which lies directly under an imaginary surface extending upward and outward at right angles to the approach zone direction or arc centerline and centerline extended at a slope of 2:1 from the sides of the primary surfaces and from the sides of the approach surfaces for 250 feet from the edge of the primary surface and 250 feet from the defining direction or arc.
(4) Lateral Extension Zones. All that land which lies directly under an imaginary surface starting from the point where the approach/departure path meets the primary surface, extending upward at the same slope as the approach/departure path and expanding uniformly outward to be 100 feet wide at 2,000 feet from the primary surface. Lateral extensions may be used to mitigate obstructions in Transitional Zones.
(B) Height restrictions. Except as otherwise provided in this chapter, and except as necessary and incidental to heliport operations, no structure or tree shall be constructed, altered, maintained, or allowed to grow in any airspace zone created in § 152.16(A) so as to project above any of the imaginary air space surfaces described in said § 152.16(A) hereof. Where an area is covered by more than one height limitation, the more restrictive limitation shall prevail.
(C) Boundary limitations. The heliport airspace obstruction height zoning restrictions set forth in this section shall apply for a distance not to exceed one mile beyond the perimeter of the heliport boundary.
(Ord. passed 11-2-20)