§ 4. Zones.

In order to carry out the purposes of this ordinance, airport approach surface zones, horizontal surface zones, conical surface zones, and transitional surface zones are hereby established as hereinafter defined and as shown on the attached airport zoning plan.

(1)

Approach surface zones. The approach surface zone is an inclined plane located directly above the approach area. The dimensions of the approach area are measured horizontally. The approach areas for each particular runway are symmetrically located with respect to the extended runway centerlines and have lengths and widths as shown on the attached airport zoning plan, which also shows the slopes of the respective approach surface zones.

(2)

Horizontal surface zone. The horizontal surface zone is a plane, circular in shape, with its height 150 feet above the established airport elevation and having a radius from the airport reference point as indicated on the attached airport zoning plan.

(3)

Conical surface zone. The conical surface zone extends upward and outward from the periphery of the horizontal surface zone with a slope of 20:1 measured in a vertical plane passing through the airport reference point. Measuring radially outward, from the periphery of the horizontal surface zone, the conical surface extends for a horizontal distance as shown on the attached airport zoning plan.

(4)

Transitional surface zones. The transitional surface zones are inclined planes with a slope of 7:1 measured upward and outward in a vertical plane at right angles to the center line of the runway. The transitional surface zones, symmetrically located on either side of the runway, extend upward and outward from a line on either side of the runway which is parallel to and level with the runway centerline. These parallel lines are at a horizontal distance from the runway centerline equal to one-half of the minimum width of each approach area as shown on the attached airport zoning plan.