175.01 Definitions | 175.08 Airport Zoning Administrator |
175.02 Airport Zones | 175.09 Board of Adjustment |
175.03 Airport Zone Height Limitations | 175.10 Appeals |
175.04 Use Restrictions | 175.11 Judicial Review |
175.05 Nonconforming Uses | 175.12 Violations |
175.06 Permits | 175.13 Conflicting Regulations |
175.07 Enforcement |
As used in this chapter, unless the context otherwise requires:
1. “Airport” means the Grinnell Regional Airport.
2. “Airport elevation” means the highest point of an airport’s usable landing area measured in feet from sea level.
3. “Approach surface” means a surface longitudinally centered on the extended runway centerline, extending outward and upward from the end of the primary surface and at the same slope as the approach zone height limitation slope set forth in Section 175.03 of this chapter. In plan the perimeter of the approach surface coincides with the perimeter of the approach zone.
4. “Approach, transitional, horizontal, and conical zones” are set forth in Section 175.02 of this chapter.
5. “Board of Adjustment” means a board consisting of five (5) members appointed by the Council as provided in Chapter 329 of the Code of Iowa.
6. “Conical surface” means a surface extending outward and upward from the periphery of the horizontal surface at a slope of twenty to one (20:1) for a horizontal distance of 4,000 feet.
7. “Hazard to air navigation” means an obstruction determined to have a substantial adverse effect on the safe and efficient utilization of the navigable airspace.
8. “Height” – for the purpose of determining the height limits in all zones set forth in this chapter and shown on the zoning map, the datum shall be mean sea level elevation unless otherwise specified.
9. “Horizontal surface” means a horizontal plane 150 feet above the established airport elevation, the perimeter of which in plan coincides with the perimeter of the horizontal zone.
10. “Nonconforming use” means any pre-existing structure, object of natural growth, or use of land which is inconsistent with the provision of this chapter or an amendment thereto.
11. “Nonprecision instrument runway” means a runway having an existing instrument approach procedure utilizing air navigation facilities with only horizontal guidance, or area type navigation equipment, for which a straight-in nonprecision instrument approach procedure has been approved or planned.
12. “Obstruction” means any structure, growth, or other object, including a mobile object, which exceeds a limiting height set forth in Section 175.03 of this chapter.
13. “Person” means an individual, firm, partnership, corporation, company, association, joint stock association, or governmental entity; includes a trustee, a receiver, an assignee, or a similar representative of any of them.
14. “Primary surface” means a surface longitudinally centered on a runway. When the runway has a specially prepared hard surface, the primary surface extends 200 feet beyond each end of that runway; for military runways or when the runway has no specially prepared hard surface, or planned hard surface, the primary surface ends at each end of that runway. The width of the primary surface is set forth in Section 175.02 of this chapter. The elevation of any point on the primary surface is the same as the elevation of the nearest point on the runway centerline.
15. “Runway” means a defined area on an airport prepared for landing and takeoff of aircraft along its length.
16. “Structure” means an object, including a mobile object, constructed or installed by man, including but without limitation, buildings, towers, cranes, smokestacks, earth formation, and overhead transmission lines.
17. “Transitional surfaces” – these surfaces extend outward at 90-degree angles to the runway centerline and the runway centerline extended at a slope of seven (7) feet horizontally for each foot vertically from the sides of the primary and approach surfaces to where they intersect the horizontal and conical surfaces. Transitional surfaces for those portions of the precision approach surfaces, 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 approach surface at 90-degree angles to the extended runway centerline.
18. “Tree” means any object of natural growth.
19. “Utility runway” means a runway that is constructed for and intended to be used by propeller driven aircraft of 12,500 pounds maximum gross weight and less.
20. “Visual runway” means a runway intended solely for the operation of aircraft using visual approach procedures.
21. “Larger than utility runway” means a runway that is constructed for and intended to be used by propeller driven aircraft of greater than 12,500 pounds maximum gross weight and jet powered aircraft.
In order to carry out the provisions of this chapter, there are hereby created and established certain zones which include all of that land lying beneath the approach surfaces, transitional surfaces, horizontal surfaces, and conical surfaces as they apply to the Grinnell Regional Airport. Such zones are shown on the Grinnell Regional Airport zoning map which is attached to the ordinance codified in this chapter and made a part hereof by reference. Said map is on file in the offices of the City. An area located in more than one of the following zones is considered to be only in the zone with the more restrictive height limitation. The various zones are hereby established and defined as follows:
1. Utility Runway Nonprecision Instrument Approach Zone (20:1 zone). The inner edge of this approach zone coincides with the width of the primary surface and is 500 feet wide. The approach zone expands outward uniformly to a width of 2,000 feet at a horizontal distance 5,000 feet from the primary surface. Its centerline is the continuation of the centerline of the runway.
2. Runway Larger than Utility with a Visibility Minimum Greater than ¾-Mile Nonprecision Instrument Approach Zone (34:1 zone). The inner edge of this approach zone coincides with the width of the primary surface and is 500 feet wide. The approach zone expands outward uniformly to a width 3,500 feet at a horizontal distance of 10,000 feet from the primary surface. Its centerline is the continuation of the centerline of the runway.
3. Horizontal Zone. The horizontal zone is established by swinging arcs of 5,000 feet radii for all runways designated utility or visual and 10,000 feet for all others from the center of each end of the primary surface of each runway and connecting the adjacent arcs by drawing lines tangent to those arcs. The horizontal zone does not include the approach and transitional zones.
4. Conical Zone. The conical zone is established as the area that commences at the periphery of the horizontal zone and extends outward therefrom a horizontal distance of 4,000 feet.
5. Transitional Zone. The transitional zone is established as the areas under the transitional surfaces.
6. Runway Protection Zone (RPZ). The runway protection zone is established as an area off the end of the runway intended to enhance the protection of people and property on the ground.
Except as otherwise provided in this chapter, no structure shall be erected, altered, or maintained, and no tree shall be allowed to grow in any zone created by this chapter to a height in excess of the applicable height limit herein established for such zone. Such applicable height limitations are hereby established for each of the zones in question as follows:
1. Utility Runway Nonprecision Instrument Approach Zone (20:1 zone). Slopes 20 feet outward for each foot upward beginning at the end of and at the same elevation as the primary surface and extending to a horizontal distance of 5,000 feet along the extended runway centerline. This approach zone shall apply to runway ends three (3) and twenty-one (21).
2. Runway Larger than Utility with a Visibility Minimum Greater than ¾-Mile Nonprecision Instrument Approach Zone (34:1 zone). Slopes 34 feet outward for each foot upward beginning at the end of and at the same elevation as the primary surface and extending to a horizontal distance of 10,000 feet along the extended runway centerline. This approach zone shall apply to runway ends thirteen (13) and thirty-one (31).
3. Transitional Zone. Slopes seven feet outward for each foot upward beginning at the sides of and at the same elevation as the primary surface and the approach surface, and extending to a height of 150 feet above the airport elevation which is 1,009 feet above mean sea level. In addition to the foregoing, there are established height limits sloping seven feet outward for each foot upward beginning at the sides of and at the same elevation as the approach surface, and extending to where they intersect the conical surface.
4. Horizontal Zone. Established at 150 feet above the airport elevation or at a height of 1,159 feet above mean sea level.
5. Conical Zone. Slopes 20 feet outward for each foot upward beginning at the periphery of the horizontal zone and at 150 feet above the airport elevation and extending to a height of 350 feet above the airport elevation.
6. Certain Structures Prohibited. No structure shall be erected in the City, Poweshiek County or Jasper County that raises the published Minimum Descent Altitude of Decision Height 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 City, Poweshiek County or Jasper County.
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