Definitions. As used in this section, unless the context otherwise requires, the following terms shall have the meaning assigned:
AIRPORT ELEVATION
The highest point of an airport's usable landing area measured in feet from sea level.
AIRPORT SURFACE
A surface longitudinally centered on the extended runway center line extending outward and upward from the end of the primary surface and at the same slope a the approach zone height limitation slope set forth in Subsection C of this section. In plan, the perimeter of the approach surface coincides with the perimeter of the approach zone.
APPROACH, TRANSITIONAL, HORIZONTAL AND CONICAL ZONES
These zones are set forth in this section.
CONICAL SURFACE
A surface extending outward and upward from the periphery of the horizontal surface at a slope of 20 to one for a horizontal distance of 4,000 feet.
HAZARD TO AIR NAVIGATION
An obstruction determined to have a substantial adverse effect on the safe and efficient utilization of the navigable airspace.
HORIZONTAL SURFACE
A horizontal plane 150 feet above the established airport elevation, the perimeter of which in plan coincides with the perimeter of the horizontal zone.
LARGER THAN UTILITY RUNWAY
A runway that is constructed for and intended to be used by propeller-driven aircraft of greater than 12,500 pounds maximum gross weight and jet-powered aircraft.
NONPRECISION INSTRUMENT RUNWAY
A runway having an existing instrument approach procedure utilizing air navigation facilities with only horizontal guidance, or area type navigation equipment, for which a straight-in nonprecision instrument approach procedure has been approved or planned.
OBSTRUCTION
Any structure, growth or other object, including a mobile object which exceeds a limiting height set forth in this section.
PRECISION INSTRUMENT RUNWAY
A runway having an existing instrument approach procedure utilizing an instrument landing system (ILS) or a precision approach radar (PAR). It also means a runway for which a precision approach system is planned and is so indicated on an approved airport layout plan or any other planning document.
PRIMARY SURFACE
A surface longitudinally centered on a runway. When the runway has a specially prepared hard surface, the primary surface extends 200 feet beyond each end of that runway; for military runways or 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 is set forth in this section. The elevation of any point on the primary surface is the same as the elevation of the nearest point on the runway center line.
TRANSITIONAL SURFACES
These surfaces extend outward at ninety-degree angles to the runway center line and the runway center line extended at a slope of seven feet horizontally for each foot vertically from the sides of the primary and approach surfaces to where they intersect the horizontal and conical surfaces. Transitional surfaces for those portions of the precision approach surfaces, which project through and beyond the limits of the conical surface, extend a distance of 5,000 feet measured horizontally from the edge of the approach surface and at ninety-degree angles to the extended runway center line.
UTILITY RUNWAY
A runway that is constructed for and intended to be used by propeller-driven aircraft of 12,500 pounds maximum gross weight and less.
VISUAL RUNWAY
A runway intended solely for the operation of aircraft using visual approach procedures.