(1) “Airport” means the North Bend Municipal Airport.

(2) “Airport direct impact area” means the area located within 5,000 feet of an airport runway, excluding lands within the runway protection zone and approach surface.

(3) “Airport elevation.” The most current and approved North Bend Municipal Airport master plan, airport layout plan, defines the highest point of the airport’s usable landing area. The 2002 Airport Layout Plan has established the airport elevation as 17.1 feet above mean sea level (reference datum is NAVD 88).

(4) “Airport imaginary surfaces” means imaginary areas in space and on the ground that are established in relation to the airport and its runways. Imaginary areas are defined by the primary surface, runway protection zone, approach surface, horizontal surface, conical surface and transitional surface.

(5) “Airport noise impact boundary” means areas located within 1,500 feet of an airport runway or within the most current, established noise contour boundaries exceeding 55 Ldn.

(6) “Airport secondary impact area” means the area located between 5,000 and 10,000 feet from the airport’s runways.

(7) “Airport sponsor” means the owner, manager, or other person or entity designated to represent the interests of the airport.

(8) “Approach surface” means a surface longitudinally centered on the extended runway center line and extending outward and upward from each end of the primary surface.

(9) “Conical surface” means a surface extending outward and upward from the periphery of the horizontal surface at a slope of 20:1 for a horizontal distance of 4,000 feet.

(10) “Department of Aviation” means the Oregon Department of Aviation, formerly the Aeronautics Division of the Oregon Department of Transportation.

(11) “FAA” means the Federal Aviation Administration.

(12) “FAA’s technical representative” means, as used in this chapter, the federal agency providing the FAA with expertise on wildlife and bird strike hazards as they relate to airports. This may include, but is not limited to, the USDA-APHIS-Wildlife Services.

(13) “Height” means the highest point of a structure or tree, plant or other object of natural growth, measured from mean sea level (reference datum is NAVD 88).

(14) “Horizontal surface” means a horizontal plane 150 feet above the established airport elevation, the perimeter of which is constructed by swinging arcs of 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:

(15) “Nonprecision instrument runway” means 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 has been approved, or planned, and for which no precision approach facilities are planned or indicated on an FAA-approved airport layout plan or FAA planning document.

(16) “Obstruction” means any structure or tree, plant or other object of natural growth that penetrates an airport imaginary surface.

(17) “Other than utility runway” means a runway that is constructed for and intended to be used by turbine-driven aircraft or by propeller-driven aircraft exceeding 12,500 pounds gross weight.

(18) “Precision instrument runway” means a runway having an existing instrument approach procedure utilizing air navigation facilities that provide both horizontal and vertical guidance, such as an instrument landing system (ILS) or 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 or other FAA planning document.

(19) “Primary surface” means a surface longitudinally centered on a runway. When a runway has a specially prepared hard surface, the primary surface extends 200 feet beyond each end of that runway. 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 center line. The width of the primary surface is:

(20) “Public assembly facility” means a permanent or temporary structure or facility, place or activity where concentrations of people gather in reasonably close quarters for purposes such as deliberation, education, worship, shopping, employment, entertainment, recreation, sporting events, or similar activities. Public assembly facilities include, but are not limited to, schools, churches, conference or convention facilities, employment and shopping centers, arenas, athletic fields, stadiums, clubhouses, museums, and similar facilities and places, but do not include parks, golf courses or similar facilities unless used in a manner where people are concentrated in reasonably close quarters. Public assembly facilities also do not include air shows, structures or uses approved by the FAA in an adopted airport master plan, or places where people congregate for short periods of time such as parking lots or bus stops.

(21) “Runway” means a defined area on the airport prepared for landing and takeoff of aircraft.

(22) “Runway protection zone (RPZ)” means an area off the runway end used to enhance the protection of people and property on the ground. The RPZ is trapezoidal in shape and centered about the extended runway center line. The inner width of the RPZ is the same as the width of the primary surface. The outer width of the RPZ is a function of the type of aircraft and specified approach visibility minimum associated with the runway end. The RPZ extends from each end of the primary surface for a horizontal distance of:

(23) “Significant,” as it relates to bird strike hazards, means a level of increased flight activity by birds across an approach surface or runway that is more than incidental or occasional, considering the existing ambient level of flight activity by birds in the vicinity.

(24) “Structure” means any constructed or erected object which requires location on the ground or is attached to something located on the ground. Structures include but are not limited to buildings, decks, fences, signs, towers, cranes, flagpoles, antennas, smokestacks, earth formations and overhead transmission lines. Structures do not include paved areas.

(25) “Transitional surface” means those surfaces that extend upward and outward at 90-degree angles to the runway center line and the runway center line extended at a slope of seven feet horizontally for each foot vertically (7:1) from the sides of the primary and approach surfaces to the point of intersection with 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 a 90-degree angle to the extended runway center line.

(26) “Utility runway” means a runway that is constructed for and intended to be used by propeller-driven aircraft of 12,500 pounds maximum gross weight or less.

(27) “Visual runway” means a runway intended solely for the operation of aircraft using visual approach procedures, where no straight-in instrument approach procedures or instrument designations have been approved or planned, or are indicated on an FAA-approved airport layout plan or any other FAA planning document.

(28) “Water impoundment” includes wastewater-treatment-related ponds, surface mining ponds, detention and retention ponds, artificial lakes and ponds, and similar water features. A new water impoundment includes an expansion of an existing water impoundment except where such expansion was previously authorized by land use action approved prior to the effective date of the ordinance codified in this chapter.