(A) Air space zones. In order to carry out the purpose of this subchapter, as set forth above, the following air space zones are hereby established and defined 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.
(a) 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.
(b) 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.
(c) The approach surface inclines upward at a slope of 8:1 and expands uniformly to a width of 250 feet either side of the defining direction or arc at a distance 4,000 feet from the primary surface.
(d) 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; and
(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.
(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 air space zone created in division (A) above so as to project above any of the imaginary air space surfaces described in division (A) above. Where an area is covered by more than one height limitation, the more restrictive limitation shall prevail.
(Prior Code, § 515.33) (Ord. 20181107-02, passed 11-7-2018; Ord. 20210217-09, passed 2-17-2021)