Sec. 3-22. - Limiting heights above ground.

In addition to the requirements of Section 3-21 , trees, structures or other objects shall be considered obstructions to air navigation (unless a special aeronautical study indicates otherwise) if they occur in any one or more of the following categories or are more than five hundred feet (500′) above ground elevation at any point within the boundaries of the county; provided, however, that nothing herein provided is intended to excuse compliance with any applicable law or regulation of the state or of the United States of America:

(a)

Trees, structures or other objects on the land directly below instrument runway approach zones shall be considered obstructions to air navigation if the tree, structure or other object is more than one hundred feet (100′) above the ground or more than one hundred feet (100′) above the approach end of the landing area, whichever permits the higher elevation of the tree, structure or other objects within three (3) statute miles of the end of the landing area, and increasing in permissive height twenty-five feet (25′) for each additional statute mile of distance outward from the landing area, but not to exceed two hundred and fifty feet (250′) in permissive height within fifty thousand feet (50,000′) from the end of the landing area.

(b)

Trees, structures or other objects on the land directly below the turning zone and within ten (10) miles of the airport reference point shall be considered obstructions to air navigation if the tree, structure or other object is more than one hundred and seventy feet (170′) above the ground or more than one hundred and seventy feet (170′) above the published airport elevation, whichever permits the higher elevation of the tree, structure or other object within three (3) statute miles of the airport reference point and increasing in permissive height in the proportion of one hundred feet (100′) for each additional mile of distance from the airport reference point, but not to exceed five hundred feet (500′) above the ground within ten (10) statute miles from the airport reference point.

(c)

Trees, structures or other objects whose elevation would increase the final approach minimum flight altitude. The final approach minimum flight altitude is normally established from the highest point within five (5) statute miles of the center line of the final approach course of a radio facility used for final letdown to an airport, and extends for a distance of ten (10) statute miles along this course outward from the radio facility. The radio facility may be a radio range, nondirectional beacon (if marker), fan marker or the outer marker of an instrument landing system.

(d)

Trees, structures or other objects within a civil airway or air traffic control area, more than one hundred and seventy feet (170′) above the ground or more than an elevation that would require the increase in an established minimum flight altitude, whichever permits the higher elevation of the object. The minimum flight altitudes are normally established from the highest point within five (5) statute miles of the center line of the civil airway or air traffic control area for the section or airway or control area affected.

(Ord. No. 629 § 7.)