§ 17.34.010. Airport zones—Established.

In order to carry out the provision of this title, there are created and established certain zones which include all of the land lying within the approach zones, transitional zones, horizontal zones, and conical zones as they apply to the Bert Mooney-Silver Bow County Airport. 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:

A.

Utility Runway Visual Approach. The inner edge of this approach zone coincides with the end of the primary surface and is five hundred feet wide for runway 29 and two hundred fifty feet for runways 2 and 20. The approach zone for runways 2, 20 and 29 expands outward uniformly to a width of one thousand two hundred fifty feet at a horizontal distance of five thousand feet from the primary surface. Its centerline is the continuation of the centerline of the runway.

B.

Utility Runway Nonprecision Instrument Approach Zone. The inner edge of this approach zone coincides with the end of the primary surface and is five hundred feet wide. The approach zone for runway 11 expands outward uniformly to a width of two thousand feet from the primary surface. Its centerline is the continuation of the centerline of the runway.

C.

Runway Larger Than Utility Visual Approach Zone. The inner edge of this approach zone coincides with the end of the primary surface and is one thousand feet wide. The approach zone for runway 33 expands outward uniformly to a width of one thousand five hundred feet at a horizontal distance of five thousand feet from the primary surface. Its centerline is the continuation of the runway.

D.

Precision Instrument Runway Approach Zone. The inner edge of this approach zone coincides with the end of the primary surface and is one thousand feet wide. The approach zone for runway 15 expands outward uniformly to a width of sixteen thousand feet at a horizontal distance of fifty thousand feet from the primary surface. Its centerline is the continuation of the centerline of the runway.

E.

Transitional Zones. These zones are established as the area beneath the transitional surfaces. These surfaces extend outward and upward at ninety-degree angles to a runway centerline extended at a slope of seven feet horizontally or each foot vertically from the sides of the primary and approach surfaces to where they intersect the horizontal and conical surfaces. Transitional zones for those portions of the precision approach zones which project through and beyond the limits of the conical surface extend a distance of five thousand feet measured horizontally from the edge of the approach zones and at ninety-degree angles to the extended runway centerline.

F.

Horizontal Zone. The horizontal zone is established by swinging arcs of ten thousand feet radii from the center of each end of the primary surface of runways 15 through 33, and connecting the adjacent arcs by drawing lines tangent to those arcs. The horizontal zone does not include the approach and transitional zones.

G.

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 four thousand feet. The conical zone does not include the precision instrument approach zones and the transitional zones.

(Ord. 53 § 160-1, 1978)