As used in this chapter, unless the context otherwise requires:
1. “Airport” means the Arthur N. Neu Municipal Airport.
2. “Airport elevation” means the highest point of an airport’s usable landing area measured in feet above mean sea level, which elevation is established to be 1,204 feet.
3. “Airport hazard” means any structure or tree or use of land that would exceed the Federal obstruction standards as contained in 14 CFR 77.21, 77.23, and 77.25, and that obstructs the airspace required for the flight of aircraft and landing or takeoff at an airport or is otherwise hazardous to such landing or taking off of aircraft.
4. “Airport primary surface” means a surface longitudinally centered on a runway. When the runway has a specially prepared hard surface, the primary surface extends two hundred (200) feet beyond each end of that runway. The width of the primary surface of a runway will be that width prescribed in Part 77 of the Federal Aviation Regulations (FAR) for the most precise approach existing or planned for either end of that runway. The elevation of any point on the primary surface is the same as the elevation of the nearest point on the runway centerline.
5. “Airspace height” means, for the purpose of determining the height limits in all zones set forth in this chapter and shown on the zoning map, sea level elevation unless otherwise specified.
6. “Control zone” means airspace extending upward from the surface of the earth, which zone may include one or more airports and is normally a circular area of five (5) statute miles in radius, with extensions where necessary to include instrument approach and departure paths.
7. “Instrument runway” means a runway having an existing instrument approach procedure utilizing air navigation facilities or area type navigation equipment, for which an instrument approach procedure has been approved or planned.
8. “Minimum descent altitude” means the lowest altitude expressed in feet above mean sea level, to which descent is authorized on final approach or during circle-to-land maneuvering in execution of a standard instrument approach procedure, where no electronic glide slope is provided.
9. “Minimum en route altitude” means the altitude in effect between radio fixes which assures acceptable navigational signal coverage and meets obstruction clearance requirements between those fixes.
10. “Minimum obstruction clearance altitude” means the specified altitude in effect between radio fixes on VOR airways, off-airways routes, or route segments which meets obstruction clearance requirements for the entire route segment and which assures acceptable navigational signal coverage only within twenty-two (22) miles of a VOR.
11. “Runway” means a defined area on an airport prepared for landing and take-off of aircraft along its length.
12. “Visual runway” means a runway intended solely for the operation of aircraft using visual approach procedures with no straight-in instrument approach procedure and no instrument designation indicated on an FAA approved airport layout plan, military services approved military airport layout plan, or by any planning document submitted to the FAA by competent authority.
In order to carry out the provisions of this section, there are hereby created and established certain zones that are depicted on the Arthur N. Neu 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 13 and 31, and 5,000 feet for Runways 3 and 21, and connecting the adjacent arcs by lines tangent to those arcs. No structure shall exceed 150 feet above the established airport elevation in the horizontal zone, as depicted on the Arthur N. Neu Municipal Airport Height Zoning Map.
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 Arthur N. Neu 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.
(Note: An approach surface is 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 is:
(1) 250 feet wide for Runways 3 and 21.
(2) 500 feet wide for Runways 13 and 31.
B. The outer edge of the approach zone is:
(1) 1,250 feet for Runways 3 and 21 (visual utility runways).
(2) 3,500 feet for Runways 13 and 31 (non-precision instrument with visibility minimums more than ¾ statute mile).
C. The approach zone extends for a horizontal distance of 10,000 feet at a slope of 34 to one for Runways 13 and 31 (non-precision instrument with visibility minimums more than ¾ statute mile); and 5,000 feet at a slope of 20 to 1 for Runways 3 and 21 (visual utility runways).
No structure shall exceed the approach surface to any runway, as depicted on the Arthur N. Neu 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 Arthur N. Neu Municipal Airport Height Zoning Map.
5. Increase in Elevation of Structures. No structure shall be erected in the 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.
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