kpayne on VMOFRWIN702 with $$_JOB

Federal Aviation Administration, DOT

Section 77.21

(iv) 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.
(d) 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.
(1) The inner edge of the approach
surface is the same width as the primary surface and it expands uniformly
to a width of:
(i) 1,250 feet for that end of a utility
runway with only visual approaches;
(ii) 1,500 feet for that end of a runway
other than a utility runway with only
visual approaches;
(iii) 2,000 feet for that end of a utility
runway with a non-precision instrument approach;
(iv) 3,500 feet for that end of a nonprecision instrument runway other
than utility, having visibility minimums greater that three-fourths of a
statute mile;
(v) 4,000 feet for that end of a nonprecision instrument runway, other
than utility, having a non-precision instrument approach with visibility
minimums as low as three-fourths statute mile; and
(vi) 16,000 feet for precision instrument runways.
(2) The approach surface extends for
a horizontal distance of:
(i) 5,000 feet at a slope of 20 to 1 for
all utility and visual runways;
(ii) 10,000 feet at a slope of 34 to 1 for
all non-precision instrument runways
other than utility; and
(iii) 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.
(3) 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.
(e) 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.
Section 77.21 Department of Defense (DOD)
airport imaginary surfaces.
(a) Related to airport reference points.
These surfaces apply to all military
airports. For the purposes of this section, a military airport is any airport
operated by the DOD.
(1) Inner horizontal surface. A plane
that is oval in shape at a height of 150
feet above the established airfield elevation. The plane is constructed by
scribing an arc with a radius of 7,500
feet about the centerline at the end of
each runway and interconnecting these
arcs with tangents.
(2) Conical surface. A surface extending from the periphery of the inner
horizontal surface outward and upward
at a slope of 20 to 1 for a horizontal distance of 7,000 feet to a height of 500 feet
above the established airfield elevation.
(3) Outer horizontal surface. A plane,
located 500 feet above the established
airfield elevation, extending outward
from the outer periphery of the conical
surface for a horizontal distance of
30,000 feet.
(b) Related to runways. These surfaces
apply to all military airports.
(1) Primary surface. A surface located
on the ground or water longitudinally
centered on each runway with the same
length as the runway. The width of the
primary surface for runways is 2,000
feet. However, at established bases
where substantial construction has
taken place in accordance with a previous lateral clearance criteria, the
2,000-foot width may be reduced to the
former criteria.
(2) Clear zone surface. A surface located on the ground or water at each
end of the primary surface, with a
length of 1,000 feet and the same width
as the primary surface.
(3) Approach clearance surface. An inclined plane, symmetrical about the

699

VerDate Sep<11>2014

16:30 Jun 25, 2019

Jkt 247047

PO 00000

Frm 00709

Fmt 8010

Sfmt 8010

Q:\14\14V2.TXT

PC31