In order to carry out the provisions of this section, there are hereby created and established certain zones which are depicted on the Municipal Airport Height Zoning Map. A structure located in more than one zone of the following zones is considered to be only in the zone with the more restrictive height limitations. The various zones are hereby established and defined as follows:
1. Horizontal Zone. The land lying under a horizontal plane 150 feet above the established elevations, the perimeter of which is constructed by swinging arcs of 10,000 feet radii from the center of each end of the primary surface of runways 12 and 30 and connecting the adjacent arcs by lines tangent to those arcs.
2. Conical Zone. The land lying under a surface extending outward and upward from the periphery of the horizontal surface at a slope of 20 feet to one for a horizontal distance of 4,000 feet. No structure shall penetrate the conical surface in the conical zone, as depicted on the Municipal Airport Height Zoning Map.
3. Approach Zone. The land lying under the surface longitudinally centered on the extended runway centerline and extending outward and upward from each end of the primary surface.
A. The inner edge of the approach surface is:
(1) 250 feet wide for runways 6 and 24.
(2) 500 feet wide for runways 12 and 30.
B. The outer edge of the approach zone is:
(1) 1,250 feet for runways 6 and 24.
(2) 1,500 feet for runway 12.
(3) 3,500 feet for runway 30.
C. The approach zone extends for a horizontal distance of:
(1) 5,000 feet at a slope of 20 to 1 for runways 12, 6, and 24.
(2) 10,000 feet at a slope of 34 to 1 for runway 30.
No structure shall exceed the approach surface to any runway, as depicted on the Municipal Airport Height Zoning Map.
4. Transitional Zone. The land lying under those surfaces extending 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. No structures shall exceed the transitional surface, as depicted on the Municipal Airport Height Zoning Map.
5. Increase in Elevation of Structures. No structure shall be erected in Crawford County that raises the published minimum descent altitude for an instrument approach to any runway, nor shall any structure be erected that causes the minimum obstruction clearance altitude or minimum en route altitude to be increased on any Federal airway in the County. Further, no such structure shall be erected which interferes with the operation of any airport or landing strip or constitutes a hazard to air navigation. For communications stations and towers see also the restrictions contained in the Crawford County Zoning Ordinances, Zone A-1, Special Exception, Uses and Structures, paragraph 7, which provisions shall continue to be applicable.