1. “Airport reference point” is the geometrical center of all usable runways;

2. “Airport elevation” is the highest point of an airport's usable runways measured in feet from mean sea level;

3. “Approach surface” is an imaginary surface shaped like a trapezoid:

4. “Commission” means the Oklahoma Aeronautics Commission or a successor agency;

5. “Conical surface” is an imaginary surface extending outward and upward from the periphery of the horizontal surface at a slope of twenty (20) to one (1) for a horizontal distance of four thousand (4,000) feet;

6. “FAA” means the Federal Aviation Administration or a successor agency to the Federal Aviation Administration;

7. “Horizontal surface” is an imaginary horizontal plane one hundred fifty (150) feet above the established airport elevation, the perimeter of which is constructed by swinging arcs of ten thousand (10,000) feet radii from a point located on the extended runway centerline two hundred (200) feet beyond each end of runway pavement and connecting the adjacent arcs by lines tangent to those arcs;

8. “Incompatible purpose” means the use of a building, structure or area as a residence, educational center (including all types of primary and secondary schools, preschools, and child-care facilities), place of worship, place of public assembly, hospital, medical inpatient treatment facility, nursing/convalescent home, retirement home, transportation facility, storage facility, aboveground utility facility or similar use;

9. “Legal representative” means a person who is authorized to legally bind an entity;

10. “Permit” means a permit issued by the Commission under this act;

11. “Person” means an individual, firm, partnership, corporation, association, or body politic and includes a trustee, receiver, assignee, or other similarly authorized representative of any of them;

12. “Primary surface” is a surface longitudinally centered on a runway. When the runway has a specially prepared hard surface, the primary surface extends two hundred (200) feet beyond each end of that runway; but when the runway has no specially prepared hard surface, or planned hard surface, the primary surface ends at each end of that runway. The elevation of any point on the primary surface is the same as the elevation of the nearest point on the runway centerline. The width of the primary surface is one thousand (1,000) feet;

13. “Public-use airport” means a structure or an area of land or water that is designed and set aside for the landing and taking off of aircraft, is utilized or to be utilized by and in the interest of the public for the landing and taking off of aircraft and is identified by the FAA as a public-use airport. Public-use airport shall include any military airport operated by a branch of the armed services of the United States government. Public-use airport shall not include any privately owned airport for private use as identified by the FAA, or any airport owned by a municipality with a population exceeding five hundred thousand (500,000) according to the most recent Federal Decennial Census;

14. “Runway” means the portion of an airport designated as the area used for the landing or takeoff of aircraft;

15. “Runway protection zone” is a trapezoidal zone centered along the extended runway centerline, beyond each end of the primary surface, two thousand five hundred (2,500) feet long, with an inner width of one thousand (1,000) feet and an outer width of one thousand seven hundred fifty (1,750) feet. The function of the runway protection zone is to enhance the protection of people and property on the ground;

16. “Structure” means any constructed or installed object including, but not limited to, buildings, towers, wind turbines, smokestacks, electronic transmission or receiving towers, and antennae and overhead transmission lines. The term does not include:

17. “Total structure height” means the elevation of the ground above mean sea level at the structure's location, plus the height of the structure above ground level in feet, plus the applicable survey type adjustment provided the survey adjustment is in accordance with Federal Aviation Administration standards.