In order to carry out the provisions of this chapter, there are hereby created and established certain zones which include all of the land and airspace within Instrument Approach Zones, Visual Approach Zones, Transitional Zones, Horizontal Zones, and Conical Zones. Such areas and zones are shown in approximation on the City of Rigby Airport Zoning Map on file in the City. The various zones are hereby established and defined as follows:
A. Primary Zone: A Primary Zone is centered longitudinally on a runway. When the runway has a specially prepared surface, the Primary Zone extends two hundred feet (200') beyond each end of that runway; but when the runway has no specially prepared hard surface the Primary Zone ends at each end of the runway. The elevation of any point on the Primary Zone coincides with the elevation of the nearest point on the runway centerline. The width of a Primary Zone is two hundred fifty feet (250') for utility runways having non-precision instrument approach. The width of the Primary Zone of a runway will be that width prescribed in this subsection for the most precise approach existing or planned for either end of that runway.
1. Effect: The Primary Zone has the effect of limiting the heights of structures or trees off the ends of active hard surface runways for a distance of two hundred feet (200').
B. Approach Zone: An Approach Zone is longitudinally centered on the extended runway centerline and extends outward and upward from each end of the Primary Zone. An Approach Zone is applied to each end of each runway based upon type of approach available or planned for that runway end.
1. Inner Edge: The inner edge of the Approach Zone is the same width as the Primary Zone and it expands uniformly to a width of: a) one thousand two hundred fifty feet (1,250') for that end of a utility runway with only visual approach; b) two thousand feet (2,000') for that end of a utility runway with an instrument approach.
2. Approach: The Approach Zone for utility runways with a non- precision instrument approach and/or visual approach extends for a horizontal distance of five thousand feet (5,000') at a slope of twenty to one (20:1).
3. Outer Width: The outer width of an Approach Zone to an end of a runway will be that width prescribed in this subsection for the most precise approach existing or planned for that runway.
4. Effect: The effect of the Approach Zone at the City of Rigby Airport is to further extend the twenty to one (20:1) slope and height limitations of Visual and Non-Precision Zones to a distance of five thousand feet (5,000') from the active runways.
C. Visual Approach Zone: A Visual Approach Zone is established at each of all visual runways. The Visual Approach Zone shall have a width of two hundred fifty feet (250') at a distance of two hundred feet (200') beyond each end of the runway, widening thereafter uniformly to a width of four hundred fifty feet (450') at a distance of one thousand feet (1,000') beyond each end of the runway, the zone centerline being the continuation of the centerline of the runway, and the zone slope will be twenty to one (20:1).
1. Effect: The Visual Zone has the effect of limiting the heights of structures or trees off the ends of visual approach runways for a distance of one thousand feet (1,000') from the height of zero (0) on the airport property (section 7-7-6 of this chapter) to approximately fifty feet (50') in height at a distance of one thousand feet (1,000') from the end of the active runways.
D. Nonprecision Approach Zone: A Nonprecision Approach Zone is established at each end of all non-precision runways for non- instrument landings and takeoffs. The Nonprecision Approach Zone shall have a width of two hundred fifty feet (250') at a distance of two hundred feet (200') beyond each end of the runway, widening thereafter uniformly to a width of four hundred fifty feet (450') at a distance of one thousand feet (1,000') beyond each end of the runway, the zone centerline will be the continuation of the centerline of the runway, and the zone slope will be twenty to one (20:1).
1. Effect: The effect of the Nonprecision Approach Zone is identical to that of the Visual Approach Zone, above.
E. Transitional Zone: Transitional Zones extend outwards and upwards at right angles to the runway centerline and the runway centerline extended at a slope of seven to one (7:1) from the sides of the Primary Zone and from the sides of the Approach Zones. Transitional Zones for those portions of the Precision Approach Zone which project through and beyond the limits of the Conical Zone, extend a distance of five thousand feet (5,000') measures horizontally from the edge of the Approach Zone and at right angles to the runway centerline.
1. Effect: The effect of the Transitional Zone is to limit heights of structures or trees from zero (0) at the edge of the active runway (section 7-7-6 of this chapter) to approximately one hundred fifty feet (150') above airport elevation at a horizontal distance of five thousand feet (5,000') from the edge of the Primary Zone, on a slope of seven to one (7:1).
F. Horizontal Zone: A Horizontal Zone is established, consisting of a plane one hundred fifty feet (150') above the established airport elevation, the perimeter of the Horizontal Zone being established by swinging arcs of specified radius from the center of each end of the Primary Zone of each runway and connecting the adjacent arcs by line tangent to those arcs. The radius of each arc is: 1) five thousand feet (5,000') for all runways designated as utility or visual; and 2) ten thousand feet (10,000') for all runways other than utility designated as instrument runways. The radius of the arc specified for each end of a runway will have the same arithmetical value. That value will be the highest determined for either end of the runway. When a five thousand foot (5,000') arc is encompassed by tangents connected to adjacent ten thousand foot (10,000'), the five thousand foot (5,000') arc shall be disregarded on the construction of the perimeter of the Horizontal Zone.
1. Effect: The effect of the Horizontal Zone is to limit the height of structures or trees to less than one hundred fifty feet (150') above airport elevation for a distance of approximately five thousand feet (5,000') horizontally from the active runway.
G. Conical Zone: A Conical Zone extends outwards and upwards from the periphery of the Horizontal Zone at a slope of twenty to one (20:1) for a horizontal distance of four thousand feet (4,000').
1. Effect: The effect of the Conical Zone is to provide additional height limitations for structures or trees a distance greater than five thousand feet (5,000') horizontally from the active runway.
As of January 1, 2016, the City of Rigby Airport has no approved or planned instrument approaches. The runways are open for visual approaches at all hours of the day and night, weather permitting. However, nothing in this chapter shall be construed as prohibiting or discouraging future development of instrument approaches at the airport. FAA regulations for such approaches may require future modifications of this chapter. Runway/taxiway lighting can be activated by pilot(s) prior to a visual take off or landing and may remain active for a period of time following such activities. (Ord. 2017-590, 4-6-2017)