§ 413. Definitions.

Airport: Jackson County Airport (see illustration).

Airport elevation: The highest point of an airports usable landing area measured in feet from sea level. For purposes of this division, the airport elevation is 950.6 feet mean sea level.

Approach surface: A surface longitudinally centered on the extended runway centerline and extending outward and upward from each end of the primary surface. An approach surface is applied to each end of each runway based upon the type of approach available or planned for that runway end. The inner edge of the approach surface is the same width as the primary surface and it expands uniformly to a width of: 1,250 feet for that end of a utility runway with only visual approaches; 1,500 feet for that end of a runway other than a utility runway with only visual approaches; 2,000 feet for that end of a utility runway with a non-precision instrument approach; 3,500 feet for that end of a non-precision instrument runway other than utility, having visibility minimums greater that three-fourths of a statute mile; 4,000 feet for that end of a non-precision instrument runway, other than utility, having a non-precision instrument approach with visibility minimums as low as three-fourths statute mile; and 16,000 feet for precision instrument runways. The approach surface extends for a horizontal distance of: 5,000 feet at a slope of 20 to one for all utility and visual runways; 10,000 feet at a slope of 34 to one for all non-precision instrument runways other than utility; and 10,000 feet at a slope of 50 to one with an additional 40,000 feet at a slope of 40 to one for all precision instrument runways. The outer width of an approach surface to an end of a runway will be that width prescribed for the most precise approach existing or planned for that runway end.

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.

Departure end of runway: The end of the runway that is opposite the landing threshold. It is sometimes referred to as the stop end of runway.

Departure surface: A trapezoidal shape that begins at the end of the takeoff distance available (TODA) and extends along the extended runway centerline and with a slope, starting at the elevation of the end of the TODA, of one unit vertically for every 40 units horizontally. Departure surfaces, when clear, allow pilots to follow standard departure procedures.

Hazard to air navigation: An obstruction determined to have a substantial adverse effect on the safe and efficient utilization of the navigable airspace.

Height: For the purpose of determining the height limits in all airport zones set forth in this division, the datum shall be mean sea level elevation unless otherwise specified.

Heliport primary surface: The area of the primary surface coincides in size and shape with the designated takeoff and landing area of a heliport. This surface is a horizontal plane at the elevation of the established heliport elevation.

Horizontal surface: A horizontal plane 150 feet above the established airport elevation, the perimeter of which is constructed by swinging arcs of a specified radii from the center of each end of the primary surface of each runway of each airport and connecting the adjacent arcs by lines tangent to those arcs. The radius of each arc is:

(1)

Five thousand feet for all runways designated as utility or visual;

(2)

Ten thousand feet for all other runways.

The radius of the arc specified for each end of a runway will have the same arithmetical value. That value will be the highest determined for either end of the runway. When a 5,000-foot arc is encompassed by tangents connecting two adjacent 10,000-foot arcs, the 5,000-foot arc shall be disregarded on the construction of the perimeter of the horizontal surface.

Instrument departure runway: A runway identified by the airport operator, through the appropriate FAA airports office, to the FAA regional airspace procedures team intended primarily for instrument departures.

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.

Nonconforming use: Any pre-existing structure, object of natural growth, or use of land which is inconsistent with the provisions of this division or an amendment thereto.

Non-precision 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 non-precision instrument approach procedure has been approved, or planned, and for which no precision approach facilities are planned, or indicated on an FAA planning document or military service military airport planning document.

Obstruction: Any structure, growth, or other object, including a mobile object, which exceeds a limiting height set forth in this division.

Part 77: United States Code of Federal Regulations, Title 14: Aeronautics and Space, chapter I—Federal Aviation Administration, Department of Transportation, subchapter E—Airspace, part 77—Safe, Efficient Use, and Preservation of the Navigable Airspace.

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 by an FAA-approved airport layout plan; a military service approved military airport layout plan; any other FAA planning document, or military service military airport 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; but when the runway has no specially prepared 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: 250 feet for utility runways having only visual approaches; and 500 feet for utility runways having non-precision instrument approaches. For other than utility runways, the width is: 500 feet for visual runways having only visual approaches; 500 feet for non-precision instrument runways having visibility minimums greater than three-fourths statute mile; 1,000 feet for a non-precision instrument runway having a non-precision instrument approach with visibility minimums as low as three-fourths of a statute mile, and for precision instrument runways. The width of the primary surface of a runway will be that width prescribed in this section for the most precise approach existing or planned for either 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.

Runway: A defined area of an airport prepared for landing and takeoff of aircraft along its length.

Structure: An object, including a mobile object, constructed or installed by man, including, but without limitation, buildings, towers, cranes, smokestacks, earth formations and overhead transmission lines.

Transitional surface: These surfaces extend outward and upward at right (90-degree) angles to the runway centerline and the runway centerline extended at a slope of seven to one (seven feet horizontally for each foot vertically) from the sides of the primary surface and from the sides of the approach surfaces to where they intersect the horizontal and conical surfaces. Transitional surfaces for those portions of the precision approach surface 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 right (90-degree) angles to the runway centerline or centerline extended.

Tree: Any object of natural growth.

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, with no straight-in instrument approach procedure and no instrument designation indicated on an FAA-approved airport layout plan, a military service approved military airport layout plan, or by any planning document submitted to the FAA by competent authority.

(Ord. No. 17-003 , § 1, 10-2-2017)