Section 19-12-5 - Civil airport imaginary surfaces The following civil airport imaginary surfaces shall be established with relation to the airport and to each runway. The size of each imaginary surface shall be based on the category of each runway according to the type of approach available or planned for that runway. The slope and dimensions of the approach surface applied to each end of a runway shall be determined by the most precise approach existing or planned for that runway end.
(1) Horizontal surface shall be a horizontal plane one hundred fifty feet above the established airport elevation, the perimeter of which shall be constructed by swinging arcs of specified radii from the center of each end of the primary surface of each runway of each airport and connecting the adjacent ares by lines tangent to those arcs. The radius of each arc shall be: (A) five thousand feet, for all runways designated as utility or visual;(B) Ten thousand feet for all other runways. The radius of the arc specified for each end of a runway shall have the same arithmetical value. That value shall be the highest determined for either end of the runway. When a five thousand-foot arc is encompassed by tangents connecting two adjacent ten thousand-foot arcs, the five thousand-foot arc shall be disregarded on the construction of the perimeter of the horizontal surface.
(2) Conical surface shall be a surface extending outward and upward from the periphery of the horizontal surface at a slope of twenty to one for a horizontal distance of four thousand feet.(3) Primary surface shall be a surface longitudinally centered on a runway. When the runway has a specially prepared hard surface, the primary surface shall extend two hundred feet beyond each end of that runway; but when the runway has no specially prepared hard surface or planned hard surface, the primary surface shall end at each end of that runway. The elevation of any point on the primary surface shall be the same as the elevation of the nearest point on the runway centerline. The width of a primary surface shall be:
(A) Two hundred fifty feet for Utility runways having only visual approaches.(B) Five hundred feet for utility runways having nonprecision instrument approaches.(C) For other than utility runways, the width shall be:(i) Five hundred feet for visual runways having, only visual approaches.(ii) Five hundred feet for nonprecision instrument runways having visibility minimums greater than three-fourths statute mile.(iii) One thousand feet for a nonprecision instrument runway having a nonprecision instrument approach with a visibility minimum as low as three-fourths of a statute mile, and for precision instrument runways. The width of the primary surface of a runway shall be that width prescribed in this section for the most precise approach existing or planned for either end of that runway.(4) Approach surface shall be surface longitudinally centered on the extended runway centerline and extending outward and upward from each end of the primary surface. An approach surface shall be applied to each end of each runway based upon the type of approach available or planned for that runway end. (A) The inner edge of the approach surface shall be the same width as the primary surface and shall expand uniformly to a width of:(i) One thousand two hundred fifty feet for that end of a utility runway with only visual approaches;(ii) One thousand five hundred feet for that end of a runway other than a utility runway with only visual approaches;(iii) Two thousand feet for that end of utility runway with a nonprecision instrument approach;(iv) Three thousand five hundred feet for that end of a nonprecision instrument runway other than utility having visibility minimums greater than three-fourths of a statute mile;(v) Four thousand feet for that end of a nonprecision instrument runway, other than utility, having a nonprecision instrument approach with visibility minimums as low as three-fourths statute mile; and(vi) Sixteen thousand feet for precision instrument runways.(B) The approach surface shall extend for a horizontal distance of: (i) Five thousand feet at a slope of twenty to one for all utility and visual runways;(ii) Ten thousand feet at a slope of thirty-four to one for all nonprecision instrument runways other than utility; and(iii) Ten thousand feet at a slope of fifty to one with an additional forty thousand feet at a slope of forty to one for all precision instrument runways.(C) The outer width of an approach surface to an end of a runway shall be that width prescribed in this paragraph (4) for the most precise approach existing or planned for that runway end.(5) Transitional surfaces shall extend outward and upward at right angles to the runway centerline and the runway centerline extended at a slope of seven to one from the sides of the primary surface and from the sides of the approach surfaces. Transitional surfaces for those portions of the precise approach surface which project through and beyond the limits of the conical surface shall extend a distance of five thousand feet measured horizontally from the edge of the approach surface and at right angles to the runway centerline.[Eff 6/12/81; am and comp 8/30/97; comp JUN 18 2007] (Auth: HRS § 262-3) (Imp: HRS § 262-6)