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14 CFR Ch. I (1–1–24 Edition)
§ 150.7
(d) Acceptance of a noise exposure
map does not constitute an FAA deter-
mination that any specific parcel of
land lies within a particular noise con-
tour. Responsibility for interpretation
of the effects of noise contours upon
subjacent land uses, including the rela-
tionship between noise contours and
specific properties, rests with the spon-
sor or with other state or local govern-
ment.
[Doc. No. 18691, 49 FR 49269, Dec. 18, 1984, as
amended by Amdt. 150–4, 69 FR 57625, Sept.
24, 2004]
§ 150.7 Definitions.
As used in this part, unless the con-
text requires otherwise, the following
terms have the following meanings.
Airport
means any public use airport,
including heliports, as defined by the
ASNA Act, including: (a) Any airport
which is used or to be used for public
purposes, under the control of a public
agency, the landing area of which is
publicly owned; (b) any privately
owned reliever airport; and (c) any pri-
vately owned airport which is deter-
mined by the Secretary to enplane an-
nually 2,500 or more passengers and re-
ceive scheduled passenger service of
aircraft, which is used or to be used for
public purposes.
Airport noise compatibility program
and
program
mean that program, and all re-
visions thereto, reflected in documents
(and revised documents) developed in
accordance with appendix B of this
part, including the measures proposed
or taken by the airport operator to re-
duce existing noncompatible land uses
and to prevent the introduction of ad-
ditional noncompatible land uses with-
in the area.
Airport Operator
means, the operator
of an airport as defined in the ASNA
Act.
ASNA Act
means 49 U.S.C. 47501
et seq.
Average sound level
means the level,
in decibels, of the mean-square, A-
weighted sound pressure during a speci-
fied period, with reference to the
square of the standard reference sound
pressure of 20 micropascals.
Compatible land use
means the use of
land that is identified under this part
as normally compatible with the out-
door noise environment (or an ade-
quately attenuated noise level reduc-
tion for any indoor activities involved)
at the location because the yearly day-
night average sound level is at or below
that identified for that or similar use
under appendix A (Table 1) of this part.
Day-night average sound level
(DNL)
means the 24-hour average sound level,
in decibels, for the period from mid-
night to midnight, obtained after the
addition of ten decibels to sound levels
for the periods between midnight and 7
a.m., and between 10 p.m., and mid-
night, local time. The symbol for DNL
is L
dn
.
Noise exposure map
means a scaled,
geographic depiction of an airport, its
noise contours, and surrounding area
developed in accordance with section
A150.1 of Appendix A of this part, in-
cluding the accompanying documenta-
tion setting forth the required descrip-
tions of forecast aircraft operations at
that airport during the fifth calendar
year (or later) beginning after submis-
sion of the map, together with the
ways, if any, those operations will af-
fect the map (including noise contours
and the forecast land uses).
Noise level reduction
(NLR) means the
amount of noise level reduction in
decibels achieved through incorpora-
tion of noise attenuation (between out-
door and indoor levels) in the design
and construction of a structure.
Noncompatible land use
means the use
of land that is identified under this
part as normally not compatible with
the outdoor noise environment (or an
adequately attenuated noise reduction
level for the indoor activities involved
at the location) because the yearly
day-night average sound level is above
that identified for that or similar use
under appendix A (Table 1) of this part.
Regional Airports Division Manager
means the Airports Division Manager
having responsibility for the geo-
graphic area in which the airport in
question is located.
Restriction affecting flight procedures
means any requirement, limitation, or
other action affecting the operation of
aircraft, in the air or on the ground.
Sound exposure level
means the level,
in decibels, of the time integral of
squared A-weighted sound pressure
during a specified period or event, with
reference to the square of the standard
reference sound pressure of 20
