Section 150.9

14 CFR Ch. I (1-1-19 Edition)

micropascals and a duration of one second.
Yearly day-night average sound level
(YDNL) means the 365-day average, in
decibels, day-night average sound
level. The symbol for YDNL is also Ldn.
[Doc. No. 18691, 49 FR 49269, Dec. 18, 1984, as
amended by Amdt. 150-1, 53 FR 8724, Mar. 16,
1988; 53 FR 9726, Mar. 24, 1988; Amdt. 150-2, 54
FR 39295, Sept. 25, 1989; Amdt. 150-4, 69 FR
57625, Sept. 24, 2004]

Section 150.9 Designation of noise systems.
For purposes of this part, the following designations apply:
(a) The noise at an airport and surrounding areas covered by a noise exposure map must be measured in Aweighted sound pressure level (LA) in
units of decibels (dBA) in accordance
with the specifications and methods
prescribed under appendix A of this
part.
(b) The exposure of individuals to
noise resulting from the operation of
an airport must be established in terms
of yearly day-night average sound level
(YDNL) calculated in accordance with
the specifications and methods prescribed under appendix A of this part.
(c) Uses of computer models to create
noise contours must be in accordance
with the criteria prescribed under appendix A of this part.
Section 150.11 Identification of land uses.
For the purposes of this part, uses of
land which are normally compatible or
noncompatible with various noise exposure levels to individuals around airports must be identified in accordance
with the criteria prescribed under appendix A of this part. Determination of
land use must be based on professional
planning criteria and procedures utilizing comprehensive, or master, land
use planning, zoning, and building and
site designing, as appropriate. If more
than one current or future land use is
permissible, determination of compatibility must be based on that use most
adversely affected by noise.
Section 150.13 Incorporations by reference.
(a) General. This part prescribes certain standards and procedures which
are not set forth in full text in the
rule. Those standards and procedures
are hereby incorporated by reference

and were approved for incorporation by
reference by the Director of the Federal Register under 5 U.S.C. 552(a) and
1 CFR part 51.
(b) Changes to incorporated matter. Incorporated matter which is subject to
subsequent change is incorporated by
reference according to the specific reference and to the identification statement. Adoption of any subsequent
change in incorporated matter that affects compliance with standards and
procedures of this part will be made
under 14 CFR part 11 and 1 CFR part 51.
(c) Identification statement. The complete title or description which identifies each published matter incorporated by reference in this part is as
follows:
International Electrotechnical Commission
(IEC) Publication No. 179, entitled  - Precision
Sound Level Meters, -  dated 1973.

(d) Availability for purchase. Published
material incorporated by reference in
this part may be purchased at the price
established by the publisher or distributor at the following mailing addresses.
IEC publications:
(1) The Bureau Central de la Commission
Electrotechnique, Internationale, 1, rue de
Varembe, Geneva, Switzerland.
(2) American National Standards Institute,
1430 Broadway, New York, NY 10018.

(e) Availability for inspection. A copy
of each publication incorporated by
reference in this part is available for
public inspection at the following locations:
(1) FAA Office of the Chief Counsel,
Rules Docket, AGC-200, Federal Aviation
Administration
Headquarters
Building, 800 Independence Avenue,
SW., Washington, DC 20591.
(2) The respective Regional Offices of
the Federal Aviation Administration
as follows. The most current mailing
address, phone numbers, and States
covered by each region are available on
the
FAA-s
Web
site
at
http://
www.faa.gov/arp/index.cfm?nav = hq.
(i) New England Regional Office, 12
New England Executive Park, Burlington, Massachusetts 01803.
(ii) Eastern Regional Office, Airports
Division, 1 Aviation Plaza, Jamaica,
NY 11434-4809.

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