SectionSection 91.807-91.813

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

that airplane has been shown to comply with Stage 2 or Stage 3 noise levels
under part 36 of this chapter.
SectionSection 91.807-91.813

[Reserved]

Section 91.815 Agricultural and fire fighting
airplanes: Noise operating limitations.
(a) This section applies to propellerdriven, small airplanes having standard
airworthiness certificates that are designed for  - agricultural aircraft operations -  (as defined in Section 137.3 of this
chapter, as effective on January 1, 1966)
or for dispensing fire fighting materials.
(b) If the Airplane Flight Manual, or
other approved manual material information, 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 chapter, no person may operate that airplane, except - 
(1) To the extent necessary to accomplish the work activity directly associated with the purpose for which it is
designed;
(2) To provide flight crewmember
training in the special purpose operation for which the airplane is designed; and
(3) To conduct  - nondispensing aerial
work operations -  in accordance with
the requirements under Section 137.29(c) of
this chapter.

kpayne on VMOFRWIN702 with $$_JOB

Section 91.817

Civil aircraft sonic boom.

(a) No person may operate a civil aircraft in the United States at a true
flight Mach number greater than 1 except in compliance with conditions and
limitations in an authorization to exceed Mach 1 issued to the operator
under appendix B of this part.
(b) In addition, no person may operate a civil aircraft for which the maximum operating limit speed MM0 exceeds a Mach number of 1, to or from
an airport in the United States, unless - 
(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 paragraph (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)

Section 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 operated in the United States, after July
31, 1978.
(b) Airport use. Except in an emergency, the following apply to each person who operates a civil supersonic airplane to or from an airport in the
United States:
(1) Regardless of whether a type design change approval is applied for
under part 21 of this chapter, no person
may land or take off an airplane covered by this section for which the type
design is changed, after July 31, 1978, in
a manner constituting an  - acoustical
change -  under Section 21.93 unless the acoustical change requirements of part 36
are complied with.
(2) No flight may be scheduled, or
otherwise planned, for takeoff or landing after 10 p.m. and before 7 a.m. local
time.
Section 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 provisions.
SectionSection 91.823-91.849

[Reserved]

Section 91.851 Definitions.
For the purposes of SectionSection 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, Paragraph 4.4, Maximum Noise Levels, of

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