Section 19-12-6 - Airport imaginary surfaces for heliports(a) Heliport primary surface. The area of the primary surface shall coincide in size and shape with the designated take-off and landing area of a heliport. This, surface shall be a horizontal plane at the elevation of the established heliport elevation.(b) Heliport approach surface. The approach surface shall begin at each end of the heliport primary surface, shall have the same width as the primary surface, and shall extend outward and upward at a slope of eight to one for a horizontal distance of four thousand feet where its width is five hundred feet.(c) Heliport transitional surfaces. These surfaces shall extend outward and upward from the lateral boundaries of the heliport primary surface and from the approach surfaces at a slope of two to one for a distance of two hundred fifty feet measured horizontally from the centerline of the primary and approach surfaces.[Eff 6/12/81; comp 8/30/97; comp JUN 18 2007] (Auth: HRS § 262-3) (Imp: HRS § 262-6)