title-14-part-77-sec77-15

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14 CFR Ch. I (1–1–24 Edition)

§ 77.11

or settlement where the shielded struc-
ture will not adversely affect safety in
air navigation;

(2) Any air navigation facility, air-

port visual approach or landing aid,
aircraft arresting device, or meteoro-
logical device meeting FAA-approved
siting criteria or an appropriate mili-
tary service siting criteria on military
airports, the location and height of
which are fixed by its functional pur-
pose;

(3) Any construction or alteration for

which notice is required by any other
FAA regulation.

(4) Any antenna structure of 20 feet

or less in height, except one that would
increase the height of another antenna
structure.

§ 77.11

Supplemental notice require-

ments.

(a) You must file supplemental no-

tice with the FAA when:

(1) The construction or alteration is

more than 200 feet in height AGL at its
site; or

(2) Requested by the FAA.
(b) You must file supplemental no-

tice on a prescribed FAA form to be re-
ceived within the time limits specified
in the FAA determination. If no time
limit has been specified, you must sub-
mit supplemental notice of construc-
tion to the FAA within 5 days after the
structure reaches its greatest height.

alteration proposal that requires sup-
plemental notice, you must submit no-
tice to the FAA within 5 days after the
project is abandoned.

(d) If the construction or alteration

is dismantled or destroyed, you must
submit notice to the FAA within 5 days
after the construction or alteration is
dismantled or destroyed.

Subpart C—Standards for Deter-

mining Obstructions to Air
Navigation or Navigational
Aids or Facilities

§ 77.13

Applicability.

This subpart describes the standards

used for determining obstructions to
air navigation, navigational aids, or
navigational facilities. These standards
apply to the following:

(a) Any object of natural growth, ter-

rain, or permanent or temporary con-
struction or alteration, including
equipment or materials used and any
permanent or temporary apparatus.

(b) The alteration of any permanent

or temporary existing structure by a
change in its height, including appur-
tenances, or lateral dimensions, includ-
ing equipment or material used there-
in.

§ 77.15

Scope.

(a) This subpart describes standards

used to determine obstructions to air
navigation that may affect the safe and
efficient use of navigable airspace and
the operation of planned or existing air
navigation and communication facili-
ties. Such facilities include air naviga-
tion aids, communication equipment,
airports, Federal airways, instrument
approach or departure procedures, and
approved off-airway routes.

(b) Objects that are considered ob-

structions under the standards de-
scribed in this subpart are presumed
hazards to air navigation unless fur-
ther aeronautical study concludes that
the object is not a hazard. Once further
aeronautical study has been initiated,
the FAA will use the standards in this
subpart, along with FAA policy and
guidance material, to determine if the
object is a hazard to air navigation.

ards with reference to an existing air-
port facility, and airport proposals re-
ceived by the FAA, or the appropriate
military service, before it issues a final
determination.

(d) For airports having defined run-

ways with specially prepared hard sur-
faces, the primary surface for each run-
way extends 200 feet beyond each end of
the runway. For airports having de-
fined strips or pathways used regularly
for aircraft takeoffs and landings, and
designated runways, without specially
prepared hard surfaces, each end of the
primary surface for each such runway
shall coincide with the corresponding
end of the runway. At airports, exclud-
ing seaplane bases, having a defined
landing and takeoff area with no de-
fined pathways for aircraft takeoffs
and landings, a determination must be
made as to which portions of the land-
ing and takeoff area are regularly used

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Federal Aviation Administration, DOT

§ 77.19

as landing and takeoff pathways. Those
determined pathways must be consid-
ered runways, and an appropriate pri-
mary surface as defined in § 77.19 will
be considered as longitudinally cen-
tered on each such runway. Each end of
that primary surface must coincide
with the corresponding end of that run-
way.

(e) The standards in this subpart

apply to construction or alteration
proposals on an airport (including heli-
ports and seaplane bases with marked
lanes) if that airport is one of the fol-
lowing before the issuance of the final
determination:

(1) Available for public use and is

listed in the Airport/Facility Direc-
tory, Supplement Alaska, or Supple-
ment Pacific of the U.S. Government
Flight Information Publications; or

(2) A planned or proposed airport or

an airport under construction of which
the FAA has received actual notice, ex-
cept DOD airports, where there is a
clear indication the airport will be
available for public use; or,

(3) An airport operated by a Federal

agency or the DOD; or,

(4) An airport that has at least one

FAA-approved instrument approach.

§ 77.17

Obstruction standards.

(a) An existing object, including a

mobile object, is, and a future object
would be an obstruction to air naviga-
tion if it is of greater height than any
of the following heights or surfaces:

(1) A height of 499 feet AGL at the

site of the object.

(2) A height that is 200 feet AGL, or

above the established airport ele-
vation, whichever is higher, within 3
nautical miles of the established ref-
erence point of an airport, excluding
heliports, with its longest runway
more than 3,200 feet in actual length,
and that height increases in the pro-
portion of 100 feet for each additional
nautical mile from the airport up to a
maximum of 499 feet.

(3) A height within a terminal obsta-

cle clearance area, including an initial
approach segment, a departure area,
and a circling approach area, which
would result in the vertical distance
between any point on the object and an
established minimum instrument
flight altitude within that area or seg-

ment to be less than the required ob-
stacle clearance.

(4) A height within an en route obsta-

cle clearance area, including turn and
termination areas, of a Federal Airway
or approved off-airway route, that
would increase the minimum obstacle
clearance altitude.

(5) The surface of a takeoff and land-

ing area of an airport or any imaginary
surface established under § 77.19, 77.21,
or 77.23. However, no part of the take-
off or landing area itself will be consid-
ered an obstruction.

(b) Except for traverse ways on or

near an airport with an operative
ground traffic control service furnished
by an airport traffic control tower or
by the airport management and coordi-
nated with the air traffic control serv-
ice, the standards of paragraph (a) of
this section apply to traverse ways
used or to be used for the passage of
mobile objects only after the heights of
these traverse ways are increased by:

(1) 17 feet for an Interstate Highway

that is part of the National System of
Military and Interstate Highways
where overcrossings are designed for a
minimum of 17 feet vertical distance.

(2) 15 feet for any other public road-

way.

(3) 10 feet or the height of the highest

mobile object that would normally tra-
verse the road, whichever is greater,
for a private road.

(4) 23 feet for a railroad.
(5) For a waterway or any other tra-

verse way not previously mentioned,
an amount equal to the height of the
highest mobile object that would nor-
mally traverse it.

§ 77.19

Civil airport imaginary sur-

faces.

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 ap-
proach surface applied to each end of a
runway are determined by the most
precise approach procedure existing or
planned for that runway end.