867 

Federal Aviation Administration, DOT 

§ 93.333 

A. For helicopters with a flyover noise 

level obtained in accordance with the meas-
urement procedures prescribed in Appendix 
H of 14 CFR part 36, the limit is 80 dB for hel-
icopters 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 con-
figuration of three or more passenger seats. 
The noise limit for helicopters with three or 
more passenger seats can be calculated by 
the formula: 

EPNL(H) = 80 + 10log(# PAX seats/2) dB 

B. For helicopters with a flyover noise 

level obtained in accordance with the meas-
urement procedures prescribed in Appendix J 
of 14 CFR part 36, the limit is 77 dB for heli-
copters 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 con-
figuration 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 ac-
cordance 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 air-
planes 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 configu-
ration 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 pro-
peller-driven airplanes with a takeoff noise 
level obtained in accordance with the meas-
urement 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 pas-
senger seats, increasing at 3 dB per doubling 
of the number of passenger seats for air-
planes 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 cal-
culated by the formula: 

LAmax(G) = 74 + 10log(# PAX seats/2) dB for 

certifications obtained under 14 CFR part 
36, Amendment 21 or earlier; 

LAmax(G) = 77 + 10log(# PAX seats/2) dB for 

certifications obtained under 14 CFR part 
36, Amendment 22 or later. 

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

Subpart V—Washington, DC Met-

ropolitan Area Special Flight 
Rules Area 

S

OURCE

: Docket No. FAA–2004–17005, 73 FR 

76213, Dec. 16, 2008, unless otherwise noted. 

§ 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 con-
trol of aircraft is required for reasons 
of national security, the areas de-
scribed in this subpart constitute na-
tional 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, prop-
erty, or buildings in the area. This sub-
part applies to pilots conducting any 
type of flight operations in the air-
space designated as the Washington, 
DC Metropolitan Area Special Flight 
Rules Area (DC SFRA) (as defined in 
§ 93.335), which includes the airspace 
designated as the Washington, DC Met-
ropolitan Area Flight Restricted Zone 
(DC FRZ) (as defined in § 93.335). 

§ 93.333

Failure to comply with this 

subpart. 

(a) 

Any violation. The FAA may take 

civil enforcement action against a 
pilot for violations, whether inad-
vertent or intentional, including impo-
sition 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 de-
fense 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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