788
14 CFR Ch. I (1–1–19 Edition)
§§ 91.807–91.813
that airplane has been shown to com-
ply with Stage 2 or Stage 3 noise levels
under part 36 of this chapter.
§§ 91.807–91.813
[Reserved]
§ 91.815
Agricultural and fire fighting
airplanes: Noise operating limita-
tions.
(a) This section applies to propeller-
driven, small airplanes having standard
airworthiness certificates that are de-
signed for ‘‘agricultural aircraft oper-
ations’’ (as defined in § 137.3 of this
chapter, as effective on January 1, 1966)
or for dispensing fire fighting mate-
rials.
(b) If the Airplane Flight Manual, or
other approved manual material infor-
mation, markings, or placards for the
airplane indicate that the airplane has
not been shown to comply with the
noise limits under part 36 of this chap-
ter, no person may operate that air-
plane, except—
(1) To the extent necessary to accom-
plish the work activity directly associ-
ated with the purpose for which it is
designed;
(2) To provide flight crewmember
training in the special purpose oper-
ation for which the airplane is de-
signed; and
(3) To conduct ‘‘nondispensing aerial
work operations’’ in accordance with
the requirements under § 137.29(c) of
this chapter.
§ 91.817
Civil aircraft sonic boom.
(a) No person may operate a civil air-
craft in the United States at a true
flight Mach number greater than 1 ex-
cept in compliance with conditions and
limitations in an authorization to ex-
ceed Mach 1 issued to the operator
under appendix B of this part.
(b) In addition, no person may oper-
ate a civil aircraft for which the max-
imum operating limit speed M
M0
ex-
ceeds a Mach number of 1, to or from
an airport in the United States, un-
less—
(1) Information available to the
flight crew includes flight limitations
that ensure that flights entering or
leaving the United States will not
cause a sonic boom to reach the surface
within the United States; and
(2) The operator complies with the
flight limitations prescribed in para-
graph (b)(1) of this section or complies
with conditions and limitations in an
authorization to exceed Mach 1 issued
under appendix B of this part.
(Approved by the Office of Management and
Budget under control number 2120–0005)
§ 91.819
Civil supersonic airplanes that
do not comply with part 36.
(a)
Applicability.
This section applies
to civil supersonic airplanes that have
not been shown to comply with the
Stage 2 noise limits of part 36 in effect
on October 13, 1977, using applicable
trade-off provisions, and that are oper-
ated in the United States, after July
31, 1978.
(b)
Airport use.
Except in an emer-
gency, the following apply to each per-
son who operates a civil supersonic air-
plane to or from an airport in the
United States:
(1) Regardless of whether a type de-
sign change approval is applied for
under part 21 of this chapter, no person
may land or take off an airplane cov-
ered by this section for which the type
design is changed, after July 31, 1978, in
a manner constituting an ‘‘acoustical
change’’ under § 21.93 unless the acous-
tical change requirements of part 36
are complied with.
(2) No flight may be scheduled, or
otherwise planned, for takeoff or land-
ing after 10 p.m. and before 7 a.m. local
time.
§ 91.821
Civil supersonic airplanes:
Noise limits.
Except for Concorde airplanes having
flight time before January 1, 1980, no
person may operate in the United
States, a civil supersonic airplane that
does not comply with Stage 2 noise
limits of part 36 in effect on October 13,
1977, using applicable trade-off provi-
sions.
§§ 91.823–91.849
[Reserved]
§ 91.851
Definitions.
For the purposes of §§ 91.851 through
91.877 of this subpart:
Chapter 4 noise level
means a noise
level at or below the maximum noise
level prescribed in Chapter 4, Para-
graph 4.4, Maximum Noise Levels, of
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