673 

Federal Aviation Administration, DOT 

§ 150.13 

micropascals and a duration of one sec-
ond. 

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 L

dn

. 

[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] 

§ 150.9 Designation of noise systems. 

For purposes of this part, the fol-

lowing designations apply: 

(a) The noise at an airport and sur-

rounding areas covered by a noise expo-
sure map must be measured in A- 
weighted sound pressure level (L

A

) 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 pre-
scribed under appendix A of this part. 

(c) Uses of computer models to create 

noise contours must be in accordance 
with the criteria prescribed under ap-
pendix A of this part. 

§ 150.11 Identification of land uses. 

For the purposes of this part, uses of 

land which are normally compatible or 
noncompatible with various noise expo-
sure levels to individuals around air-
ports must be identified in accordance 
with the criteria prescribed under ap-
pendix A of this part. Determination of 
land use must be based on professional 
planning criteria and procedures uti-
lizing 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 compat-
ibility must be based on that use most 
adversely affected by noise. 

§ 150.13 Incorporations by reference. 

(a) 

General. 

This part prescribes cer-

tain 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 Fed-
eral Register under 5 U.S.C. 552(a) and 
1 CFR part 51. 

(b) 

Changes to incorporated matter. 

In-

corporated matter which is subject to 
subsequent change is incorporated by 
reference according to the specific ref-
erence and to the identification state-
ment. Adoption of any subsequent 
change in incorporated matter that af-
fects 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 com-

plete title or description which identi-
fies each published matter incor-
porated 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 dis-
tributor at the following mailing ad-
dresses. 

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 loca-
tions: 

(1) FAA Office of the Chief Counsel, 

Rules Docket, AGC–200, Federal Avia-
tion 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, Bur-
lington, Massachusetts 01803. 

(ii) Eastern Regional Office, Airports 

Division, 1 Aviation Plaza, Jamaica, 
NY 11434–4809.