4-1-040 Definitions

As used in this Ordinance, the following terms, phrases, words, and their derivations shall have the meanings as hereinafter defined: A. Airport: The Brigham City Municipal Airport or any area of land designated and used for the landing and taking off of aircraft. B. Airport Elevation: The highest point of an airport's usable landing area measured in feet from mean sea level. This elevation is 4,225.5 feet MSL as of the date of this ordinance. C. Airport Hazard: Any structure or use of land which actually or potentially obstructs the airspace required for the safe flight of air craft in landing or taking off at an airport. D. Approach Surface: A surface longitudinally centered on the extended runway centerline, extending outward and upward from the end of the primary surface and at the same slope as the approach zone height limitation slope set forth in 4-1-090 of this Code. In plan, the perimeter of the approach surface coincides with the perimeter of the approach zone. E. Approach, Transitional, Horizontal, and Conical Zones: These zones are set forth in 4-1-090 of this Code. F. Conical Surface: A surface extending outward and upward from the periphery of the horizontal surface at a slope of 20 to 1 for a horizontal distance of 4,000 feet. G. F.A.R. Part 77: Federal Aviation Administration regulations pertaining to height and obstruction criteria within prescribed distances from an airport as these regulations currently exist and as may be amended from time to time. Part 77 Regulations may also affect lands located outside the boundaries of the defined Airport Influence Area. H. Hazard to Air Navigation: An obstruction determined to have a substantial adverse effect on the safe and efficient utilization of the navigable airspace. I. Height: For the purpose of determining the height limits in all zones set forth in Section 4-1-100 (G) and shown on the zoning map, the datum shall be the mean sea level (MSL) elevation unless otherwise specified. J. 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. K. Ldn: Yearly day-night average sound level. L. MSL: Mean Sea Level. M. 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. It also means a runway for which a non-precision approach system is planned and is so indicated on an approved Airport Layout Plan or any other planning document. N. Obstruction: Any structure, growth, or other object, including a mobile object, which exceeds a limiting height set forth in Section 4-1-100 (G) of this Ordinance. O. Person: An individual, firm, partnership, corporation, company, association, joint stock association, or governmental entity; includes a trustee, a receiver, an assignee, or a similar representative of any of the foregoing. P. Precision Instrument Runway: A runway having an existing instrument approach procedure utilizing an Instrument Landing System (ILS), a Precision Approach Radar (PAR), a Global Positioning System (GPS), a Transponder Landing System (TLS), or other systems providing both horizontal and vertical guidance. 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. Q. Primary Surface: A surface longitudinally centered on a runway. When the runway has a specially prepared hard surface, the primary surface extends 500 feet beyond each side of the runway and 200 beyond the 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. R. Runway: A defined area on an airport prepared for landing and takeoff of aircraft along its length. S. Structure: An object, including a mobile object, constructed or installed by man, including but not limited to, buildings, towers, cranes, smokestacks, earth formation, and overhead transmission lines. T. Transitional Surfaces: These surfaces extend outward at 90 degree angles to the runway centerline and the runway centerline extended at a slope of seven (7) 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 90 degree angles to the extended runway centerline. U. Tree: Any object of natural growth. V. 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. W. Visual Runway: A runway intended solely for the operation of aircraft using visual approach procedures.