Current through Register Vol. 63, No. 12, December 1, 2024
The following civil airport imaginary surfaces are established
with relation to the airport and to each runway. The size of each such
imaginary surface is based on the category of each runway according to the type
of approach available or planned for that runway. The slope and dimensions of
the approach surface applied to each end of a runway are determined by the most
precise approach existing or planned for that runway end:
(1) Horizontal surface:
(a) 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:
(A) 5,000 feet for all runways designated as
utility or visual;
(B) 10,000 feet
for all other runways.
(b) The radius of the arc specified for each
end of a runway will have the same arithmetical value. That value will be the
highest determined for either end of the runway. When a 5,000-foot arc is
encompassed by tangents connecting two adjacent 10,000-foot arcs, the
5,000-foot arc shall be disregarded on the construction of the perimeter of the
horizontal surface.
(2)
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.
(3) 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; but 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 centerline. The width of a primary surface is:
(a) 250 feet for utility runways having only
visual approaches;
(b) 500 feet for
utility runways having nonprecision instrument approaches;
(c) For other than utility runways the width
is:
(A) 500 feet for visual runways having
only visual approaches;
(B) 500
feet for nonprecision instrument runways having visibility minimums greater
than three-fourths statute mile;
(C) 1,000 feet for a nonprecision instrument
runway having a nonprecision instrument approach with visibility minimums as
low as three-fourths of a statute mile, and for precision instrument runways.
The width of the primary surface of a runway will be that width prescribed in
this section for the most precise approach existing or planned for either end
of that runway.
(4) Approach surface: A surface
longitudinally centered on the extended runway centerline and extending outward
and upward from each end of the primary surface. An approach surface is applied
to each end of each runway based upon the type of approach available or planned
for that runway end.
(a) The inner edge of the
approach surface is the same width as the primary surface and it expands
uniformly to a width of:
(A) 1,250 feet for
that end of a utility runway with only visual approaches;
(B) 1,500 feet for that end of a runway other
than a utility runway with only visual approaches;
(C) 2,000 feet for that end of a utility
runway with a nonprecision instrument approach;
(D) 3,500 feet for that end of a nonprecision
instrument runway other than utility, having visibility minimums greater than
three-fourths of a statute mile;
(E) 4,000 feet for that end of a nonprecision
instrument runway, other than utility, having a nonprecision instrument
approach with visibility minimums as low as three-fourths statute mile;
and
(F) 16,000 feet for precision
instrument runways.
(b)
The approach surface extends for a horizontal distance of:
(A) 5,000 feet at a slope of 20 to 1 for all
utility and visual runways;
(B)
10,000 feet at a slope of 34 to 1 for all nonprecision instrument runways other
than utility; and
(C) 10,000 feet
at a slope of 50 to 1 with an additional 40,000 feet at a slope of 40 to 1 for
all precision instrument runways.
(c) The outer width of an approach surface to
an end of a runway will be that width prescribed in this subsection for the
most precise approach existing or planned for that runway end.
(5) Transitional surface: These
surfaces extend outward and upward at right angles to the runway centerline and
the runway centerline extended at a slope of 7 to 1 from the sides of the
primary surface and from the sides of the approach surfaces. Transitional
surfaces for those portions of the precision approach surface 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
right angles to the runway centerline.
Stat. Auth.: ORS 184, ORS 835 & ORS 836
Stats. Implemented: ORS
836.530
