772
14 CFR Ch. I (1–1–24 Edition)
§ 36.9
(i) The airplane may not be a Stage 1
airplane after the change in type de-
sign; and
(ii) During the flyover and lateral
noise tests conducted before the change
in type design, the quietest airworthi-
ness approved configuration available
for the highest approved takeoff weight
must be used.
(e)
Stage 3 airplanes. If an airplane is
a Stage 3 airplane prior to the change
in type design, the following apply, in
addition to the provisions of paragraph
(b) of this section:
(1) If compliance with Stage 3 noise
levels is not required before the change
in type design, the airplane must—
(i) Be a Stage 2 airplane after the
change in type design and compliance
must be shown under the provisions of
paragraph (d)(1) or (d)(2) of this sec-
tion, as appropriate; or
(ii) Remain a Stage 3 airplane after
the change in type design. Compliance
must be shown under the provisions of
paragraph (e)(2) of this section.
(2) If compliance with Stage 3 noise
levels is required before the change in
type design, the airplane must be a
Stage 3 airplane after the change in
type design.
(3) Applications on or after [August
14, 1989.] The airplane must remain a
Stage 3 airplane after the change in
type design.
(4) If an airplane is a Stage 3 airplane
prior to a change in type design, and
becomes a Stage 4 after the change in
type design, the airplane must remain
a Stage 4 airplane.
(5) If an airplane is a Stage 3 airplane
prior to a change in type design, and
becomes a Stage 5 airplane after the
change in type design, the airplane
must remain a Stage 5 airplane.
(f)
Stage 4 airplanes. (1) If an airplane
is a Stage 4 airplane prior to a change
in type design, the airplane must re-
main a Stage 4 airplane after the
change in type design.
(2) If an airplane is a Stage 4 airplane
prior to a change in type design, and
becomes a Stage 5 airplane after the
change in type design, the airplane
must remain a Stage 5 airplane.
(g)
Stage 5 airplanes. If an airplane is
a Stage 5 airplane prior to a change in
type design, the airplane must remain
a Stage 5 airplane after the change in
type design.
[Amdt. 36–7, 42 FR 12371, Mar. 3, 1977; Amdt.
36–8, 43 FR 8730, Mar. 2, 1978; Amdt. 36–10, 43
FR 28420, June 29, 1978; Amdt. 36–12, 46 FR
33464, June 29, 1981; Amdt. 36–15, 53 FR 16366,
May 6, 1988; 53 FR 18950, May 25, 1988; Amdt.
36–17, 54 FR 21042, May 15, 1989; Amdt. 36–54,
67 FR 45212, July 8, 2002; Amdt. 36–26, 70 FR
38749, July 5, 2005; FAA Doc. No. FAA–2015–
3782, Amdt. No. 36–31, 82 FR 46130, Oct. 4,
2017]
§ 36.9
Acoustical change: Propeller-
driven small airplanes and pro-
peller-driven commuter category
airplanes.
For propeller-driven small airplanes
in the primary, normal, utility, acro-
batic, transport, and restricted cat-
egories and for propeller-driven, com-
muter category airplanes for which an
acoustical change approval is applied
for under § 21.93(b) of this chapter after
January 1, 1975, the following apply:
(a) If the airplane was type certifi-
cated under this part prior to a change
in type design, it may not subsequently
exceed the noise limits specified in
§ 36.501 of this part.
(b) If the airplane was not type cer-
tificated under this part prior to a
change in type design, it may not ex-
ceed the higher of the two following
values:
(1) The noise limit specified in § 36.501
of this part, or
(2) The noise level created prior to
the change in type design, measured
and corrected as prescribed in § 36.501 of
this part.
[Amdt. 36–16, 53 FR 47400, Nov. 22, 1988; 53 FR
50157, Dec. 13, 1988; Amdt. 36–19, 57 FR 41369,
Sept. 9, 1992]
§ 36.11
Acoustical change: Helicopters.
This section applies to all helicopters
in the primary, normal, transport, and
restricted categories for which an
acoustical change approval is applied
for under § 21.93(b) of this chapter on or
after March 6, 1986. Compliance with
the requirements of this section must
be demonstrated under appendix H of
this part, or, for helicopters having a
maximum certificated takeoff weight
of not more than 7,000 pounds, compli-
ance with this section may be dem-
onstrated under appendix J of this
part.
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