201.01 Configuration of Airport | 201.08 Enforcement |
201.02 Definitions | 201.09 Board of Adjustment |
201.03 Airport Zones | 201.10 Appeals |
201.04 Airport Zone Height Limitations | 201.11 Judicial Review |
201.05 Use Restrictions | 201.12 Violations |
201.06 Nonconforming Uses | 201.13 City Action to Prevent Unlawful Acts |
201.07 Permits |
At the time of ordinance adoption (September 12, 1998), the regulatory configuration of the Ankeny Regional Airport was as follows:
1. Runway 4/22 is a utility runway with a visual approach.
2. Runway 18/36 is a runway larger than utility with a visual minimum greater than three-fourths mile non-precision instrument approach.
As used in this chapter, unless the context otherwise requires, the following terms are defined:
1. “Airport” means the Ankeny Regional Airport.
2. “Airport Board of Adjustment” means a board consisting of five members appointed as provided in Section 329.12, Code of Iowa. The board shall have the power granted by Section 329.11 and Section 329.12.
3. “Airport elevation” means the highest point of an airport’s usable landing area measured in feet from sea level. The Ankeny Regional Airport elevation is 910 feet above mean sea level.
4. “Approach surface” means a surface longitudinally entered 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 201.04 of this chapter. In plan, the perimeter of the approach surface coincides with the perimeter of the approach zone.
5. “Conical surface” means 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 4,000 feet.
6. “Hazard to air navigation” means an obstruction determined to have a substantial adverse affect on the safe and efficient utilization of the navigable airspace.
7. “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.
8. “Horizontal surface” means a horizontal plane one hundred fifty feet above the established airport elevation, the perimeter of which in plan coincides with the perimeter of the horizontal zone.
9. “Larger than utility runway” means a runway that is constructed for and intended to be used by propeller-driven aircraft of greater than twelve thousand five hundred pounds maximum gross weight and jet powered aircraft.
10. “Nonconforming use” means any pre-existing structure, object of natural growth, or use of land which is inconsistent with the provisions of this chapter or an amendment thereto.
11. “Non-precision 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 non-precision instrument approach procedure has been approved or planned.
12. “Obstruction” means any structure, growth, or other object, including mobile object, which exceeds a limiting height set forth in Section 201.04 of this chapter.
13. “Person” means an individual, firm, partnership, corporation, company, association, joint stock association or government entity; includes a trustee, a receiver, an assignee, or a similar representative of any of them.
14. “Precision instrument runway” means a runway having an existing instrument approach procedure utilizing an instrument landing system (“ILS”), or a precision approach radar (“PAR”). It also means a runway for which a precision approach system is planned and is so indicated on an approved airport layout plan or any other planning document.
15. “Primary surface” means a surface longitudinally centered in 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 the end of that runway. The width of the primary surface is set forth in Section 201.03 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.
16. “Runway” means a defined area on an airport prepared for landing and take-off of aircraft along its length.
17. “Structure” means an object, including a mobile object, constructed or installed by man, including, but not limited to, building, towers, cranes, smokestacks, earth formation, and overhead transmission lines.
18. “Transitional surfaces” means surfaces that extend outward at ninety-degree angles to the runway centerline and the runway centerline extended at a slope of seven feet horizontally for each foot vertically from the sides of 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 and at ninety-degree angles to the extended runway centerline.
19. “Tree” means any object of natural growth.
20. “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.
21. “Visual runway” means a runway intended solely for the operation of aircraft using visual approach procedures.
In order to carry out the provisions of the ordinance codified in this chapter, there are created and established certain zones which include all of the land lying beneath the approach surfaces, transitional surfaces, horizontal surfaces, and conical surfaces as they apply to the Ankeny Regional Airport with an ultimate runway length of 5,500 feet for Runway 18/36 and 3,860 feet for Runway 4/22 as shown on the airport layout plan. Such zones are shown on the Ankeny Regional Airport zoning map consisting of one sheet, prepared by Polk County and the Polk County Aviation Authority which is attached to the ordinance codified in this chapter and made a part hereof. 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 established and defined as follows:
1. Utility Runway Visual Approach Zone. The inner edge of this approach zone coincides with the width of the primary surface and is 250 feet wide. The approach zone expands outward uniformly to a width of 1,250 feet at a horizontal distance of 5,000 feet from the primary surface. Its centerline is the continuation of the centerline of the runway. Refer to Section 201.01 of this chapter for the regulatory configuration of the Ankeny Regional Airport.
2. Utility Runway Non-Precision Instrument Approach 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.
3. Runway Larger Than Utility Visual Approach 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 1,500 feet at a horizontal distance of 5,000 feet from the primary surface. Its centerline is the continuation of the centerline of the runway.
4. Runway Larger Than Utility With a Visibility Minimum Greater Than Three-fourths Mile Non-Precision Instrument Approach 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 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. Refer to Section 201.01 of this chapter for regulatory configuration of the Ankeny Regional Airport.
5. Runway Larger Than Utility With a Visibility Minimum as Low as Three-fourths Mile Non-Precision Instrument Approach Zone. The inner edge of this approach zone coincides with the width of the primary surface and is 1,000 feet wide. The approach zone expands outward uniformly to a width of 4,000 feet at a horizontal distance of 10,000 feet from the primary surface. Its centerline is the continuation of the centerline of the runway.
6. Precision Instrument Runway Approach Zone. The inner edge of this approach zone coincides with the width of the primary surface and is 1,000 feet wide. The approach zone expands outward uniformly to a width of 16,000 feet at a horizontal distance of 50,000 feet from the primary surface. Its centerline is the continuation of the centerline of the runway.
7. Transitional Zones. The transitional zones are the areas beneath the transitional surfaces. Refer to Section 201.01 of this chapter for regulatory configuration of the Ankeny Regional Airport.
8. 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. Refer to Section 201.01 of this chapter for regulatory configuration of the Ankeny Regional Airport.
9. Conical Zones. 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. Refer to Section 201.01 of this chapter for regulatory configuration of the Ankeny Regional Airport.
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 herein established for such zone. Nothing in this chapter shall be construed as permitting any structure to exceed the Ankeny zoning ordinance district maximum height requirement without first obtaining the appropriate approvals. Where such height conflict the more restrictive shall apply. Such applicable height limitations are established for each of the zone in questions as follows:
1. Utility Runway Visual Approach 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. Refer to Section 201.01 of this chapter for regulatory configuration of the Ankeny Regional Airport.
2. Utility Runway Non-Precision Instrument Approach 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.
3. Runway Larger Than Utility Visual Approach 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.
4. Runway Larger Than Utility With a Visibility Minimum Greater Than Three-fourths Mile Non-Precision Instrument Approach 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. Refer to Section 201.01 of this chapter for regulatory configuration of the Ankeny Regional Airport.
5. Runway Larger Than Utility With a Visibility Minimum as Low as Three-fourths Mile Non-Precision Instrument Approach 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.
6. Precision Instrument Runway Approach Zone. Slopes 50 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; thence slopes upward 40 feet horizontally for each foot vertically to an additional horizontal distance of 40,000 feet along the extended runway centerline.
7. Transitional Zone. Slopes 7 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 910 feet above mean sea level. In addition to the foregoing, there are established height limits sloping 7 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. Where the precision instrument runway approach zone projects beyond the conical zone, there are established height limits sloping 7 feet outward for each foot upward beginning at the sides of and at the same elevation as the approach surface, and extending a horizontal distance of 5,000 feet measured at ninety-degree angles to the extended runway centerline. Refer to Section 201.01 of this chapter for regulatory configuration of the Ankeny Regional Airport.
8. Horizontal Zone. Established 150 feet above the airport elevation or at a height of 1,060 feet above mean sea level. Refer to Section 201.01 of this chapter for regulatory configuration of the Ankeny Regional Airport.
9. 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. Refer to Section 201.01 of this chapter for regulatory configuration of the Ankeny Regional Airport.
Notwithstanding any other provisions of this chapter, no use may be made of land or water within any zone established by this chapter in such a manner as to create electrical interference with navigational signals or radio communication between the airport and aircraft, make it difficult for pilots to distinguish between airport lights and others, result in glare in the eyes of pilots using the airport, impair visibility in the vicinity of the airport, create bird strike hazards, or otherwise in any way endanger or interfere with the landing, take-off, or maneuvering of aircraft intending to use the airport.
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