Definitions. As used in this section, unless the context otherwise
requires, the following terms shall have the meanings indicated:
AIRPORT
Northeast Philadelphia Airport in the City of Philadelphia,
Commonwealth of Pennsylvania.
AIRPORT ELEVATION
The highest point of the airport's usable landing area measured
in feet above sea level, which is 121 feet above mean sea level for
Northeast Philadelphia Airport.
AIRPORT HAZARD
Any structure or object, natural or man-made, or use of land
which obstructs the airspace required for flight of aircraft in landing
or taking off at an airport or is otherwise hazardous to the landing
or taking off of aircraft.
APPROACH SURFACE
A surface longitudinally centered on the extended runway
center line, 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 this section. In plan, the perimeter of the approach
surface coincides with the perimeter of the approach zone.
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.
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 this section and shown on the Zoning Map, the datum shall
be the mean sea level elevation unless otherwise specified.
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.
LARGER THAN UTILITY RUNWAY
Any runway that is constructed for and intended to be used
by propeller-driven aircraft of greater than 12,500 pounds maximum
gross weight and by jet-powered aircraft.
NONCONFORMING USE
Any preexisting structure, object of natural growth, or use
of land covered by this airport district which is inconsistent with
the provisions of this section 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.
OBSTRUCTION
Any structure, growth or other object, including a mobile
object, which exceeds a limiting height set forth in this section.
PERSON
An individual, firm, partnership, corporation, company, association,
joint-stock association or government entity, including a trustee,
receiver, assignee or similar representative of any of them.
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 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 200 feet 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 Subsection
C of this section. The elevation of any point on the primary surface is the same as the elevation of the nearest point on the runway center line.
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 without limitations, buildings, towers, cranes,
smokestacks, earth formations and overhead transmission lines.
TRANSITIONAL SURFACE
These surfaces extend outward at 90° angles to the runway
center line and the runway center line extended at a slope of seven
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° angles to the
extended runway center line.
TREE
Any object of natural growth.
UTILITY RUNWAY
A runway that is constructed for and intended to be used
by propeller-driven aircraft of up to 12,500 pounds maximum gross
weight.
VISUAL RUNWAY
A runway intended solely for the operation of aircraft using
visual approach procedures.