Section 93.331

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

A. For helicopters with a flyover noise
level obtained in accordance with the measurement procedures prescribed in Appendix
H of 14 CFR part 36, the limit is 80 dB for helicopters having a seating configuration of
two or fewer passenger seats, increasing at 3
dB per doubling of the number of passenger
seats for helicopters having a seating configuration of three or more passenger seats.
The noise limit for helicopters with three or
more passenger seats can be calculated by
the formula:

[Doc. No. FAA-2003-14715, 70 FR 16092, Mar.
29, 2005]

Subpart V - Washington, DC Metropolitan Area Special Flight
Rules Area
SOURCE: Docket No. FAA-2004-17005, 73 FR
76213, Dec. 16, 2008, unless otherwise noted.

EPNL(H) = 80 + 10log(# PAX seats/2) dB
B. For helicopters with a flyover noise
level obtained in accordance with the measurement procedures prescribed in Appendix J
of 14 CFR part 36, the limit is 77 dB for helicopters having a seating configuration of
two or fewer passenger seats, increasing at 3
dB per doubling of the number of passenger
seats for helicopters having a seating configuration of three or more passenger seats.
The noise limit for helicopters with three or
more passenger seats can be calculated by
the formula:
SEL(J) = 77 + 10log(# PAX seats/2) dB
C. For propeller-driven airplanes with a
measured flyover noise level obtained in accordance with the measurement procedures
prescribed in Appendix F of 14 CFR part 36
without the performance correction defined
in Sec. F35.201(c), the limit is 69 dB for airplanes having a seating configuration of two
or fewer passenger seats, increasing at 3 dB
per doubling of the number of passenger
seats for airplanes having a seating configuration of three or more passenger seats. The
noise limit for propeller-driven airplanes
with three or more passenger seats can be
calculated by the formula:
LAmax(F) = 69 + 10log(# PAX seats/2) dB
D. In the event that a flyover noise level is
not available in accordance with Appendix F
of 14 CFR part 36, the noise limit for propeller-driven airplanes with a takeoff noise
level obtained in accordance with the measurement procedures prescribed in Appendix
G is 74 dB or 77 dB, depending on 14 CFR part
36 amendment level, for airplanes having a
seating configuration of two or fewer passenger seats, increasing at 3 dB per doubling
of the number of passenger seats for airplanes having a seating configuration of
three or more passenger seats. The noise
limit for propeller-driven airplanes with
three or more passenger seats can be calculated by the formula:
kpayne on VMOFRWIN702 with $$_JOB

LAmax(G) = 77 + 10log(# PAX seats/2) dB for
certifications obtained under 14 CFR part
36, Amendment 22 or later.

LAmax(G) = 74 + 10log(# PAX seats/2) dB for
certifications obtained under 14 CFR part
36, Amendment 21 or earlier;

Section 93.331 Purpose and applicability of
this subpart.
This subpart prescribes special air
traffic rules for aircraft operating in
the Washington, DC Metropolitan
Area. Because identification and control of aircraft is required for reasons
of national security, the areas described in this subpart constitute national defense airspace. The purpose of
establishing this area is to facilitate
the tracking of, and communication
with, aircraft to deter persons who
would use an aircraft as a weapon, or
as a means of delivering weapons, to
conduct an attack on persons, property, or buildings in the area. This subpart applies to pilots conducting any
type of flight operations in the airspace designated as the Washington,
DC Metropolitan Area Special Flight
Rules Area (DC SFRA) (as defined in
Section 93.335), which includes the airspace
designated as the Washington, DC Metropolitan Area Flight Restricted Zone
(DC FRZ) (as defined in Section 93.335).
Section 93.333 Failure to comply with this
subpart.
(a) Any violation. The FAA may take
civil enforcement action against a
pilot for violations, whether inadvertent or intentional, including imposition of civil penalties and suspension
or revocation of airmen-s certificates.
(b) Knowing or willful violations. The
DC FRZ and DC SFRA were established
for reasons of national security under
the provisions of 49 U.S.C. 40103(b)(3).
Areas established by the FAA under
that authority constitute  - national defense airspace -  as that term is used in
49 U.S.C. 46307. In addition to being
subject to the provisions of paragraph

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