[Ord. 8-14-1995, § 2001;
as amended by Ord. 2007-04-01, 4/26/2007]
AIRCRAFT
Any contrivance, except an unpowered hang glider or parachute,
used for manned ascent into or flight through the air.
AIRPORT ELEVATION
The highest point of the airport's usable landing area measured
in feet from sea level which is 394 feet above mean sea level.
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 air-craft.
AIRPORT HAZARD AREA
Any area of land or water upon which an airport hazard might
be established if not prevented as provided in this chapter.
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 height limitation slope
set forth in this Part. 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 1 for a horizontal distance
of 4,000 feet.
DEPARTMENT
Pennsylvania Department of Transportation.
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 Part and shown on the airport zone map, the datum
shall be 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
A runway that is constructed for and intended to be used
by propeller driven aircraft of greater than 12,500 pounds maximum
gross weight and jet powered aircraft.
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.
OBSTRUCTION
Any structure, growth or other object, including a mobile
object, which exceeds a limiting height set forth in this Part.
PERSON
An individual, firm, partnership, corporation, company, association,
joint stock association or governmental entity, includes a trustee,
a receiver, an assignee or similar representative of any of them.
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 planed hard surface,
the primary surface ends at each end of that runway. The width of
the primary surface is set forth in this Part. The elevation of any
point on the primary surface is the same as the elevation of the nearest
point on the runway center line.
PRIVATE AIRPORT
An airport which is privately owned and which is not open
or intended to be open to the public as defined in 74 Pa.C.S.A. § 5102.
PUBLIC AIRPORT
An airport which is either publicly or privately owned and
which is open to the public as defined in 74 Pa.C.S.A. § 5102.
RUNWAY
A defined area on an airport prepared for landing and takeoff
of aircraft along its length.
STRUCTURE
For the purposes of this Part, an object, including a mobile
object, constructed or installed by man, including but without limitation,
buildings, towers, cranes, smokestacks, earth formation and overhead
transmission lines.
TRANSITIONAL SURFACES
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 12,500 pounds maximum gross weight
or less.
VISUAL RUNWAY
A runway intended solely for the operation of aircraft using
visual approach procedures.
[Ord. 8-14-1995, § 2003;
as amended by Ord. 2007-04-01, 4/26/2007]
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 Doylestown
Airport. Such zones are shown on the Doylestown Airport Zoning Map, dated August 1984, prepared by CKS Engineers, Inc., as
amended, and made a part hereof. An area located in more than one
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:
a. Utility Runway Visual Approach Surface Zone. Established beneath
the visual approach surface. The inner edge of this zone coincides
with the width of the primary surface and is 250 feet wide. The zone
expands outward uniformly to a width of 1,250 feet at a horizontal
distance of 5,000 feet from the primary surface. Its center line is
the continuation of the center line of the runway.
b. Utility Runway Non-Precision Instrument Approach Surface Zone. Established
beneath the non-precision instrument approach surface. The inner edge
of this zone coincides with the width of the primary surface and is
500 feet wide. The zone expands outward uniformly to a width of 2,000
feet at a horizontal distance 5,000 feet from the primary surface.
Its center line is the continuation of the center line of the runway.
c. Runway Larger Than Utility Visual Approach Surface Zone. Established
beneath the visual approach surface. The inner edge of this zone coincides
with the width of the primary surface and is 500 feet wide. The zone
expands outward uniformly to a width of 1,500 feet at a horizontal
distance of 5,000 feet from the primary surface. Its center line is
the continuation of the center line of the runway.
d. Runway Larger Than Utility With a Visibility Minimum Greater Than
3/4 Mile Non-Precision Instrument Approach Surface Zone. Established
beneath the non-precision instrument approach surface. The inner edge
of this zone coincides with the width of the primary surface and is
500 feet wide. The zone expands outward uniformly to a width of 3,500
feet at a horizontal distance of 10,000 feet from the primary surface.
Its center line is the continuation of the center line of the runway.
e. Runway Larger Than Utility With A Visibility Minimum As Low as 3/4
Mile Non-Precision Instrument Approach Surface Zone. Established beneath
the non-precision instrument approach surface. The inner edge of this
zone coincides with the width of the primary surface and is 1,000
feet wide. The zone expands outward uniformly to a width of 4,000
feet at a horizontal distance of 10,000 feet from the primary surface.
Its center line is the continuation of the center line of the runway.
f. Precision Instrument Runway Approach Surface Zone. Established beneath
the precision instrument approach surface. The inner edge of this
zone coincides with the width of the primary surface and is 1,000
feet wide. The zone expands outward uniformly to a width of 16,000
feet at a horizontal distance of 50,000 feet from the primary surface.
Its center line is the continuation of the center line of the runway.
g. Transitional Surface Zones. Established beneath the transitional
surfaces adjacent to each runway and approach surface as indicated
on the Height Limitation and Zoning District Map.
h. Horizontal Surface Zone. Established beneath the horizontal surface,
150 feet above the established airport elevation, the perimeter of
which is constructed by swinging arcs of 5,000 feet radii from the
center of each end of the primary surface of each runway and connecting
the adjacent arcs by drawing lines tangent to those arcs. The horizontal
surface zone does not include the approach surface and transitional
surface zones.
i. Conical Surface Zone. Established beneath the conical surface. This
zone commences at the periphery of the horizontal surface and extends
outward therefrom a horizontal distance of 4,000 feet.
[Ord. 8-14-1995, § 2003]
Except as 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 herein established for such zone. Such applicable
height limitations are hereby established for each of the zones in
question as follows:
a. Utility Runway Visual Approach Surface Zone. Slopes 20 feet 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 5,000
feet along the extended runway center line.
b. Utility Runway Non-Precision Instrument Approach Surface Zone. Slopes
20 feet 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 5,000 feet along the extended runway center line.
c. Runway Larger Than Utility Visual Approach Surface Zone. Slopes 20
feet 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 5,000 feet along the extended runway center line.
d. Runway Larger Than Utility With A Visibility Minimum Greater Than
3/4 Mile Non-Precision Instrument Approach Surface Zone. Slopes 34
feet 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 10,000 feet along the extended runway center line.
e. Runway Larger Than Utility With a Visibility Minimum As Low as 3/4
Mile Non-Precision Instrument Approach Surface Zone. Slopes 34 feet
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 10,000 feet along the extended runway center line.
f. Precision Instrument Runway Approach Surface Zone. Slopes 50 feet
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 10,000 feet along the extended runway center line; thence slopes
upward 40 feet horizontally for each foot vertically to an additional
horizontal distance of 40,000 feet along the extended runway center
line.
g. Transitional Surface Zones. Slopes seven feet 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 150 feet above the airport elevation which is 394 feet above mean
sea level. In addition to the foregoing when an airport has a precision
instrument runway approach zone, there are established height limits
sloping seven feet 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 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 5,000 feet measured at 90°
angles to the extended runway center line.
h. Horizontal Surface Zone. Established at 150 feet above the established
airport elevation or at a height of 394 feet above mean sea level.
i. Conical Surface Zone. Slopes 20 feet outward for each foot upward
beginning at the periphery of the horizontal surface and at 150 feet
above the established airport elevation and extending to a height
of 350 feet above the established airport elevation or at a height
of 394 feet above mean sea level.
j. Excepted Height Limitations. Nothing in this chapter shall be construed
as prohibiting the construction or maintenance of any structure, or
growth of any tree to a height up to 35 feet above the surface of
the land.
[Ord. 8-14-1995, § 2004]
Notwithstanding any other provisions of this chapter, no use
may be made of land or water within any zone established by this chapter
in such a manner as to create electrical interference with navigational
signals or radio communication between the airport and aircraft, make
it difficult for pilots to distinguish between airport lights and
others, result in glare in the eyes of the pilots using the airport,
impair visibility in the vicinity of the airport, create bird strike
hazards, or otherwise in any way endanger or interfere with the landing,
takeoff or maneuvering of aircraft intending to use the airport.