(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, Precision Instrument Approach Zone and Transitional Zone and whose locations and dimensions are as follows.
(1) Primary Zone.
(a) All that land which lies directly under an imaginary primary surface longitudinally centered on a runway extending 200 feet beyond each end of Runways 04-22 and 12-30. The elevation of any point on the primary surface is the same as the elevation of the nearest point on the runway centerline.
(b) The width of the primary surface is:
1. One thousand feet for Runway 12-30; and
2. Five hundred feet for Runway 04-22.
(2) Horizontal Zone. All that land which lies directly under an imaginary horizontal surface 150 feet above the established airport elevation, or a height of 1,295 feet above mean sea level, the perimeter of which is constructed by swinging arcs of specified radii from the center of each end of the primary surface of each runway and connecting the adjacent arcs by lines tangent to those areas. The radius of each arc is:
(a) Ten thousand feet for Runway 12-30; and
(b) Ten thousand feet for Runway 04-22.
(3) Conical Zone. All that land which lies directly under an imaginary conical surface extending upward and outward from the periphery of the horizontal zone at a slope of 20 to one (20:1) for a horizontal distance of 4,000 feet as measured radially outward from the periphery of the horizontal surface;
(4) Approach Zone. All that land which lies directly under an imaginary approach surface longitudinally centered on the extended centerline at each end of a runway. The inner edge of the approach surface is at the same width and elevation as, and coincides with, the end of the primary surface.
(a) The approach surface inclines upward and outward at a slope of:
1. Forty to one (40:1) for Runway 12 approach;
2. Forty to one (40:1) for Runway 04 approach; and
3. Forty to one (40:1) for Runway 22 approach.
(b) The approach surface expands uniformly to a width of the following at a distance of 10,000 feet, and then continues to the periphery of the conical surface:
1. Four thousand feet for Runway 12; and
2. Three thousand five hundred feet for Runway 04-22.
(5) Precision Instrument Approach Zone. All that land which lies directly under an imaginary precision instrument approach surface longitudinally centered on the extended centerline at the approach end of Runway 30, a precision instrument runway. The inner edge of the precision instrument approach is at the same width and elevation as, and coincides with, the end of the primary surface. The precision instrument approach surface inclines upward and outward at a slope of 50 to one (50:1) for a horizontal distance of 10,000 feet expanding uniformly to a width of 4,000 feet, then continues upward and outward for an additional horizontal distance of 40,000 feet at a slope of 40 to one (40:1), expanding uniformly to an ultimate width of 16,000 feet; and
(6) Transitional Zone. All that land which lies directly under an imaginary surface extending upward and outward at right angles to the runway centerline and centerline extended at a slope of seven to one (7:1) from the sides of the approach surfaces until they intersect with the horizontal surface or the conical surface. Transitional surfaces for those portions of the precision instrument approach surface which project through and beyond the limits of the conical surface, extend a distance of 5,000 feet measured horizontally from the edge of the precision instrument approach surface and at right angles to the extended precision instrument runway centerline.
(B) Height restrictions. Except as otherwise provided in this chapter, and except as necessary and incidental to airport operations, no structure or tree shall be constructed, altered, maintained or allowed to grow in any airspace zone created in division (A) above so as to project above any of the imaginary airspace surfaces described in said division (A) above. Where an area is covered by more than one height limitation, the more restrictive limitations shall prevail. If an existing tree grows and penetrates any of the airspace zones described above, the city will assist in the removal or trimming of the tree as necessary.
(C) Boundary limitations. The airspace obstruction zoning restrictions set forth in this section shall apply for a distance not to exceed one and one-half miles beyond the perimeter of the airport boundary and in that portion of an airport hazard area under the approach zone for a distance not exceeding two miles from the airport boundary.
(Ord. 1257, passed 5-15-2001)