(a) This subpart prescribes operating noise limits and related
requirements that apply, as follows, to the operation of civil aircraft in
the United States.
(1) Sections 91.803, 91.805, 91.807, 91.809, and 91.811 apply to civil
subsonic jet (turbojet) airplanes with maximum weights of more than 75,000
pounds and --
(i) If U.S. registered, that have standard airworthiness certificates;
(ii) If foreign registered, that would be required by this chapter to
have a U.S. standard airworthiness certificate in order to conduct the
operations intended for the airplane were it registered in the United
States. Those sections apply to operations to or from airports in the
United States under this part and parts 121, 125, 129, and 135 of this
(2) Section 91.813 applies to U.S. operators of civil subsonic jet
(turbojet) airplanes covered by this subpart. This section applies to
operators operating to or from airports in the United States under this
part and parts 121, 125, and 135, but not to those operating under part
129 of this chapter.
(3) Sections 91.803, 91.819, and 91.821 apply to U.S.-registered civil
supersonic airplanes having standard airworthiness certificates and to
foreign-registered civil supersonic airplanes that, if registered in the
United States, would be required by this chapter to have U.S. standard
airworthiness certificates in order to conduct the operations intended for
the airplane. Those sections apply to operations under this part and under
parts 121, 125, 129, and 135 of this chapter.
(b) Unless otherwise specified, as used in this subpart "part 36"
refers to 14 CFR part 36, including the noise levels under appendix C of
that part, notwithstanding the provisions of that part excepting certain
airplanes from the specified noise requirements. For purposes of this
subpart, the various stages of noise levels, the terms used to describe
airplanes with respect to those levels, and the terms "subsonic airplane"
and "supersonic airplane" have the meanings specified under part 36 of
this chapter. For purposes of this subpart, for subsonic airplanes
operated in foreign air commerce in the United States, the Administrator
may accept compliance with the noise requirements under annex 16 of the
International Civil Aviation Organization when those requirements have
been shown to be substantially compatible with, and achieve results
equivalent to those achievable under, part 36 for that airplane.
Determinations made under these provisions are subject to the limitations
of §36.5 of this chapter as if those noise levels were part 36 noise
(c) Sections 91.851 through 91.877 of this subpart prescribe operating
noise limits and related requirements that apply to any civil subsonic jet
(turbojet) airplane (for which an airworthiness certificate other than an
experimental certificate has been issued by the Administrator) with a
maximum certificated takeoff weight of more than 75,000 pounds operating
to or from an airport in the 48 contiguous United States and the District
of Columbia under this part, parts 121, 125, 129, or 135 of this chapter
on and after September 25, 1991.
(d) Section 91.877 prescribes reporting requirements that apply to any
civil subsonic jet (turbojet) airplane with a maximum weight of more than
75,000 pounds operated by an air carrier or foreign air carrier between
the contiguous United States and the State of Hawaii, between the State of
Hawaii and any point outside of the 48 contiguous United States, or
between the islands of Hawaii in turnaround service, under part 121 or 129
of this chapter on or after November 5, 1990.