1. These regulations reinforce specific provisions in the Logan-Cache Airport master plan (August 11, 1992) and the Cache Countywide comprehensive plan (January 27, 1988), as amended.
2. The boundaries of any officially recognized "airport limitation overlay zone" shall be as it appears on a map and/or other documents approved by the Smithfield City council.

As used in this chapter, unless the context otherwise requires:

AIRPORT: The Logan-Cache Airport or any area of land designated and used for the landing and taking off of aircraft.

AIRPORT ELEVATION: The highest point of an airport's usable landing area measured in feet from mean sea level. This elevation is four thousand four hundred fifty seven feet (4,457') MSL as of the effective date hereof.

AIRPORT HAZARD: Any structure or use of land which actually or potentially obstructs the airspace required for the safe flight of aircraft in landing or taking off at an airport.

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 SMC 17.91.090 of this chapter. 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 SMC 17.91.080 of this chapter.

CONICAL SURFACE: A surface extending outward and upward from the periphery of the horizontal surface at a slope of twenty to one (20:1) for a horizontal distance of four thousand feet (4,000').

FAR 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.

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 zones set forth in SMC 17.91.090D of this chapter and shown on the zoning map, the datum shall be the mean sea level (MSL) elevation unless otherwise specified.

HELIPORT PRIMARY SURFACE: 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 one hundred fifty feet (150') above the established airport elevation, the perimeter of which in plan coincides with the perimeter of the horizontal zone.

Ldn: Yearly day-night average sound level.

LARGER THAN UTILITY RUNWAY: A runway that is constructed and intended to be used by propeller driven aircraft of greater than twelve thousand five hundred (12,500) pounds' maximum gross weight and jet powered aircraft.

MSL: Mean sea level.

NONCONFORMING USE: Any preexisting structure, object or natural growth, or use which is inconsistent with the provisions of this title or an amendment thereto.

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. It also means a runway for which a nonprecision approach system is planned and is so indicated on an approved airport layout plan or any other planning document.

OBSTRUCTION: Any structure, growth or other object, including a mobile object, which exceeds a limiting height set forth in SMC 17.91.090D of this chapter.

PERSON: An individual, firm, partnership, corporation, company, association, joint stock association or governmental entity; includes a trustee, a receiver, an assign, or a similar representative of any of them.

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.

PRIMARY SURFACE: A surface longitudinally centered on a runway. When the runway has a specially prepared hard surface, the primary surface extends two hundred feet (200') 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 SMC 17.91.989E of this chapter. 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 on 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 not limited to, buildings, towers, cranes, smokestacks, earth formations, and overhead transmission lines.

TRANSITIONAL SURFACES: These surfaces extend outward at ninety degree (90°) angles to the runway centerline and the runway centerline extended at a slope of seven feet (7') 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 five thousand feet (5,000') measured horizontally from the edge of the approach surface and at ninety degree (90°) angles to the extended runway centerline.

TREE: Any object of natural growth.

UTILITY RUNWAY: A runway that is constructed for and intended to be used by propeller driven aircraft of twelve thousand five hundred (12,500) pounds' maximum gross weight and less.

VISUAL RUNWAY: A runway intended solely for the operation of aircraft using visual approach procedures.

1. Commission Established: The Smithfield City planning commission is designated as the "Smithfield airport zoning commission" as prescribed in Utah code 72-10-405.
2. References To Commission: In this title and state law, any references to the "airport zoning commission" shall mean the Smithfield planning commission. If the planning commission is empowered in this chapter to take actions that are duties of the airport zoning commission as prescribed in state law, the planning commission shall be presumed to be functioning as the airport zoning commission.
3. Duties: The airport zoning commission shall recommend boundaries of the various zones to be established and the regulations to be adopted pertaining to any airport hazard area and to perform such other duties as may be assigned to it by the Smithfield City council or Utah law.

• Appeal Authority Established: The Smithfield City appeal authority is designated as the "airport appeal authority" as prescribed in Utah code 72-10-408.
• References To Appeal Authority: In this title and state law, any references to the "airport appeal authority" shall mean the Smithfield appeal authority. If the appeal authority is empowered in this chapter to take actions that are duties of the airport appeal authority as prescribed in state law, the appeal authority shall be presumed to be functioning as the airport appeal authority.
• Duties: The airport appeal authority shall hear issues pertaining to any airport hazard area and to perform such other duties as may be assigned to it by the Smithfield City council or Utah law.

In order to carry out the provisions of this chapter, there are hereby created and established certain zones which include all of the land lying beneath the approach surfaces, transitional surfaces, horizontal surfaces and conical surfaces as they apply to the Logan-Cache Airport. Such zones are shown on the Logan-Cache Airport "part 77" airspace drawing consisting of two (2) sheets prepared by Armstrong Consultants, and dated March 1997, which are attached to the ordinance codified herein and made a part hereof. An area located in more than one of the following zones is considered to be only in the zone with the more restrictive height limitation. The various zones are hereby established and defined as follows:

1. Airport Influence Area (AIA): An area within the incorporated portions of Smithfield City, proximate to the airport, which is recognized by the city council as containing lands which might be affected by noise and/or safety hazards associated with aircraft operations associated with Logan-Cache Airport. The AIA extends from the airport to the outer edge of the conical surface.
2. Traffic Pattern Zone (TPZ): This zone extends from the airport to the outer edge of the horizontal surface.
3. 65 Ldn Noise Area (NA): The area within the sixty five (65) decibel yearly day-night average sound level.
4. Inner Approach Zone (IAZ): The inner edge of this zone coincides with the width of the primary surface of runway 17/35 and is one thousand feet (1,000') wide. It extends at a uniform width of one thousand feet (1,000') to a horizontal distance of five thousand feet (5,000') from the primary surface. The centerline of the inner approach zone is a continuation of the centerline of runway 17/35.
5. Approach Zone (AZ): The area within the FAR "part 77" approach surface for each runway.
   1. Runway precision instrument approach zone: The inner edge of this approach zone coincides with the width of the primary surface and is one thousand feet (1,000') wide. The approach surface expands outward uniformly to a width of sixteen thousand feet (16,000') at a horizontal distance of fifty thousand feet (50,000') from the primary surface. The centerline of the approach zone is the continuation of the centerline of the runway. This is the planned condition at the approach end to runway 17.
   2. Runway nonprecision instrument approach zone (larger than utility aircraft): The inner edge of this approach zone coincides with the width of the primary surface and is one thousand feet (1,000') wide. The approach zone expands outward uniformly to a width of three thousand five hundred feet (3,500') at a horizontal distance ten thousand feet (10,000') from the primary surface. Its centerline is the continuation of the centerline of the runway. This is the condition at the approach end to runway 35.
   3. Visual runway approach zone (larger than utility aircraft): The inner edge of this approach zone coincides with the width of the primary surface and is five hundred feet (500') wide. The approach surface expands uniformly to a width of one thousand five hundred feet (1,500') at a horizontal distance of five thousand feet (5,000') from the primary surface. The centerline of the approach zone is a continuation of the centerline of the runway. This is the condition at the approach end to runway 10 and 28.
6. Transitional Zones: The transitional zones are the areas beneath the transitional surfaces.
7. Horizontal Zones: The horizontal zone is established by swinging arcs of ten thousand feet (10,000') radii from the center of each end of the primary surface of runway 17/35 and connecting the adjacent arcs by drawing lines tangent to those arcs. The horizontal zone does not include the approach and transitional zones.
8. Conical Zone: The conical zone is established as the area that commences at the periphery of the horizontal zone and extends outward therefrom a horizontal distance of four thousand feet (4,000').
   

1. Conforming Uses Only: All uses in the airport limitation overlay zones shall be subject to the regulations of this chapter and prescribed development standards within the airport master plan as amended.
2. Creation Of Airport Hazards Prohibited: No variance, permit or use shall be allowed in the airport hazard area that would create or enhance an airport hazard.
3. Use And Operational Limitations Within Airport Limitation Overlay Zones: No use shall be permitted which:
   1. Creates or tends to create electrical interference to navigational devices and communication between aircraft and airports.
   2. Creates or tends to create gas, smoke, dust, glare or other visual hazards in the atmosphere around airports or in the airport hazard area.
   3. Creates or tends to create structures that interfere with aircraft safety.
   4. Creates or tends to create any type of hazard for the airport that would inhibit or constrain safe and acceptable airport operations.
4. Height Limitation: Except as exempted in SMC E of this section or otherwise provided in this chapter, no structure shall be erected, altered or maintained, and no tree shall be allowed to grow, in any zone created by this chapter to a height in excess of the applicable height limit herein established for such zone. Such applicable height limitations are hereby established for each of the zones in question as follows:
   1. Runway precision instrument approach zone: Slopes fifty feet (50') outward for each foot upward beginning at the end of and at the same elevation as the primary surface and extending to a horizontal distance of ten thousand feet (10,000') and continues on for a distance of forty thousand feet (40,000') at a slope of forty feet (40') outward for each foot upward along the extended runway centerline. (Approach to runway 17)
   2. Runway nonprecision instrument approach zone (larger than utility aircraft): Slopes thirty four feet (34') outward for each foot upward beginning at the end of and at the same elevation as the primary surface and extending to a horizontal distance of ten thousand feet (10,000') along the extended centerline. (Approach to runway 35)
   3. Visual runway approach zone: Slopes twenty feet (20') outward for each foot upward beginning at the end of and at the same elevation as the primary surface and extending to a horizontal distance of five thousand feet (5,000') along the extended runway centerline. (Approach to runways 10 and 28)
   4. Transitional zones: Slope seven feet (7') outward for each foot upward beginning at the sides of and at the same elevation as the primary surface and the approach surface, and extending to a height of one hundred fifty feet (150') above the airport elevation. In addition to the foregoing, there are established height limits sloping seven feet (7') outward for each foot upward beginning at the sides of and at the same elevation as the approach surface, and extending to where they intersect the conical surface. Where the precision instrument runway approach zone projects beyond the conical zone, there are established height limits sloping seven feet (7') outward for each foot upward beginning at the sides of and at the same elevation as the approach surface, and extending a horizontal distance of five thousand feet (5,000') measured at ninety degree (90°) angles to the extended runway centerline.
   5. Horizontal zone: Established at one hundred fifty feet (150') above the airport elevation or at a height of four thousand six hundred seven feet (4,607') above mean sea level (MSL).
   6. Conical zone: Slope twenty feet (20') outward for each foot upward beginning at the periphery of the horizontal zone and at one hundred fifty feet (150') above the airport elevation (4,607 feet MSL) and extending to a height of three hundred fifty feet (350') (4,807 feet MSL) above the airport elevation.
   7. Within ten thousand feet (10,000') of the centerline of runway 17/35 the following height limitation shall apply:
      1. From five thousand feet (5,000') of centerline of runway, the height of all structures, uses and trees shall not exceed fifty feet (50') above the contour of the land on which it is proposed to be located.
      2. From five thousand feet (5,000') to ten thousand feet (10,000') of centerline of runway, the height of all structures, uses and trees shall not exceed seventy five feet (75') above the contour of the land on which it is proposed to be located.
      3. For structures or uses from five thousand feet (5,000') to ten thousand feet (10,000') of centerline of runway, may apply to the city planning commission to exceed the seventy five feet (75') height limitation if the structure or use does not pose a threat based on the conditions outlined in SMC C of this section.
5. Exemptions To Height Limitation:
   1. Any object that would be shielded by existing structures of a permanent and substantial character or by natural terrain or topographic features of equal or greater height, and would be located in the congested area of a city, town or settlement where it is beyond all reasonable doubt that the structure so shielded will not adversely affect safety in air navigation.
   2. Structures up to and including thirty five feet (35') in height above the ground level at its site where the ground elevation at its site is less than or equal to thirty five feet (35') below the height limitations defined in SMC D of this section, and is beyond all reasonable doubt that the structure will not adversely affect safety in air navigation. If in doubt, submission of FAA form 7460-1, notice of proposed construction (as described in SMC 17.91.100 of this chapter) shall be used to determine its effect on safety in air navigation.

1. Required: Except as provided in SMC B of this section, and in addition to all other local notification and permitting requirements, each person who proposes any of the following construction or alteration activities shall complete and submit an FAA form 7460-1, notice of proposed construction, to Smithfield City and to the federal aviation administration in accordance with federal aviation regulation part 77, object affecting navigable airspace:
   1. Any construction or alteration of more than two hundred feet (200') in height above the ground level at its site.
   2. Any construction or alteration of greater height than an imaginary surface extending outward and upward at a slope of one hundred to one (100:1) for a horizontal distance of twenty thousand feet (20,000') from the nearest point of the nearest runway at the Logan-Cache Airport.
2. Exemptions From Notification:
   1. Any object that would be shielded by existing structures of a permanent and substantial character or by natural terrain or topographic features of equal or greater height, and would be located in the congested area of a city, town or settlement where it is beyond all reasonable doubt that the structure so shielded will not adversely affect safety in air navigation.
   2. Any antenna structure of twenty feet (20') or less in height, except one that would increase the height of any antenna structure.
3. Time Of Notice: The notice required under SMC A of this section must be submitted at least thirty (30) days before the earlier of the following dates:
   1. The date the proposed construction or alteration is to begin.
   2. The date an application for a construction permit is to be filed.