"Airport/heliport" means any area of land which is used, or intended for use, for the landing and takeoff of an aircraft, and any appurtenant areas which are used, or intended for use, for airport building or other airport facilities or rights of way, together with all airport buildings and facilities located thereon (see also definition of "landing strip").
A. "Airport approach" means that area of approach and transition surface areas around airports, where special land use and height regulations are established.
B. "Airport approach zone" means an imaginary surface, beginning at the end of, and at the same elevation as, the primary surface and extending a specified horizontal distance along with the extended runway centerline which is necessary for the safe takeoff and landing of aircraft. Precision approaches are preserved with a fifty foot (50') horizontal to one foot (1') vertical approach surface, ten thousand feet (10,000') long, followed by a forty thousand foot (40,000') long to one (40:1) approach surface. Visual runways have a five thousand foot (5,000') long (20:1) approach surface.
C. "Airport hazard" means any structure, tree, or use of land which hinders or obstructs the airspace required for the safe operation of aircraft in or around an airport or land field.
D. "Airport reference point" means the highest point of an airport's usable landing area, measured in feet above mean sea level.
E. "Airspace obstructions" means any structure, tree, land mass, smoke or steam, or use of land which penetrates a primary, transitional, horizontal, or conical surface of an airport as defined by federal aviation regulations (FAR part 77).
F. "Conical surface zone" means an area extending outward from the horizontal surface at a ratio of twenty to one (20:1), to a height of three hundred fifty feet (350') above the airport reference point elevation.
G. "Horizontal surface zone" means that flat, disc shaped, imaginary surface, one hundred fifty feet (150') above the airport reference point elevation, through which no structures or uses should penetrate and which is necessary to protect the airspace.
H. "Primary surface" means a surface longitudinally centered on a runway. When the runway has a specially prepared hard surface, the primary surface extends to two hundred feet (200') 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 width of the primary surface of a runway will be that width prescribed in part 77 of the federal aviation administration regulations (FAR), for the most precise approach existing or planned for either end of that runway. The elevation of any point of the primary surface is the same as the elevation of the nearest point on the runway centerline.
I. "Runway" means a defined area on an aircraft prepared for landing and/or takeoff of aircraft along its path.
J. "Transitional surface zones" means that area necessary to protect the airport approach surfaces which extends at a ratio of seven feet (7') horizontal to one foot (1') vertical, beginning at the sides of and at the same elevation as the primary and the approach surfaces, and extending to a height of one hundred fifty feet (150') above the airport reference point elevation, except where approach surface extended upward and beyond the horizontal surface. A transitional zone is also established at the same seven to one (7:1) ratio.
K. "Turning zone" means the circular area centered upon an airport reference point. (Ord. 203 §32(14), 1987)