For the purpose of this subchapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
AIRPORT. The Northwest Iowa Regional Airport.
AIRPORT ELEVATION. One thousand three hundred forty and seven-tenths feet above mean sea level.
AIRPORT HAZARD. Any structure or object of natural growth located on or in the vicinity of a public airport, or any use or land near such airport, which obstructs the airspace required for the flight of aircraft in landing or takeoff at such airport or is otherwise hazardous to such landing or takeoff of aircraft.
AIRPORT 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. The width of the PRIMARY SURFACE of a runway will be that width prescribed in Part 77 of the Federal Aviation Regulations (FAR) 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.
AIRSPACE HEIGHT MEASUREMENT. For the purpose of determining the height limits in all zones set forth in this subchapter and shown on the zoning map, the datum shall be mean sea level elevation unless otherwise specified.
BUILDING RESTRICTION LINE (BRL). A line which identifies suitable building area locations on airports. The BRL should encompass the runway protection zones, the runway object free area, the runway visibility zones, NAVAID critical areas required for terminal instrument procedures and areas addressed under 14 C.F.R. part 77(C) (airport imaginary surfaces) to appoint where the surfaces obtain a height of at least 35 feet above the primary surface.
DECISION HEIGHT. The height at which a decision must be made, during an ILS instrument approach, to either continue the approach or to execute a missed approach.
INSTRUMENT RUNWAY. A runway having an existing instrument approach procedure utilizing air navigation facilities or area type navigation equipment, for which an instrument approach procedure has been approved or planned.
MINIMUM DESCENT ALTITUDE. The lowest altitude, expressed in feet above mean sea level, to which descent is authorized on final approach or during circle to land maneuvering in execution of a standard instrument approach procedure, where no electronic glide slope is provided.
MINIMUM EN ROUTE ALTITUDE. The altitude in effect between radio fixes which assures acceptable navigational signal coverage and meets obstruction clearance requirements between those fixes.
MINIMUM OBSTRUCTION CLEARANCE ALTITUDE. The specified altitude in effect between radio fixes on VOR airways, off airway routes or route segments which meets obstruction clearance requirements for the entire route segment and which assures acceptable navigational signal coverage only within 22 miles of a VOR.
NON-CONFORMING USE. Any pre-existing structure, object of natural growth or use of land that is inconsistent with the provisions of this subchapter or amendments hereto.
NOTICE TO THE FAA OF THE PROPOSED CONSTRUCTION. Being 14 C.F.R. part 77, objects affecting navigable airspace, requires persons proposing any construction or alteration described in 14 C.F.R. § 77.13(A) to give 30 days’ notice to the FAA of their intent. This includes any construction or alteration of structures more than 200 feet in height above the ground level or at a height that penetrates defined imaginary surfaces located in the vicinity of the Northwest Iowa Regional Airport, as well as construction or alteration of greater height than an imaginary surface extending outward and upward at 100 feet to one-foot for a horizontal distance of 20,000 feet from the nearest point of the nearest runway. The affected area includes portions of the city, unincorporated portions of the county and unincorporated portions of Dickinson County.
PRECISION INSTRUMENT RUNWAY. A runway having an existing instrument approach procedure providing course and vertical path guidance conforming to instrument landing system (ILS) or microwave landing system (MLS), precision system performance standards, utilizing ILS, LAAS, WAAS, MLS and other precision systems. It also means a runway for which a precision approach system has been approved or planned.
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 human, including, but without limitation, buildings, towers, cranes, smokestacks, earth formation and overhead transmission lines.
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 services approved military airport layout plan or by any planning document submitted to the FAA by competent authority.
(Prior Code, § 9-15-2) (Ord. 210, passed 10-17-1977; Ord. 697, passed 3-1-2010)