spaschal on DSK3GDR082PROD with CFR

Federal Aviation Administration, DOT

Section 36.101

(a) General requirements. Except as
otherwise provided, for helicopters covered by this section, the acoustical
change approval requirements are as
follows:
(1) In showing compliance with the
requirements of appendix H of this
part, noise levels must be measured,
evaluated, and calculated in accordance with the applicable procedures
and conditions prescribed in parts B
and C of appendix H of this part. For
helicopters having a maximum certificated takeoff weight of not more than
7,000 pounds that alternatively demonstrate compliance under appendix J
of this part, the flyover noise level prescribed in appendix J of this part must
be measured, evaluated, and calculated
in accordance with the applicable procedures and conditions prescribed in
parts B and C of appendix J of this
part.
(2) Compliance with the noise limits
prescribed in section H36.305 of appendix H of this part must be shown in accordance with the applicable provisions
of part D of appendix H of this part.
For those helicopters that demonstrate
compliance with the requirements of
appendix J of this part, compliance
with the noise levels prescribed in section J36.305 of appendix J of this part
must be shown in accordance with the
applicable provisions of part D of appendix J of this part.
(b) Stage 1 helicopters. Except as provided in Section 36.805(c), for each Stage 1 helicopter prior to a change in type design, the helicopter noise levels may
not, after a change in type design, exceed the noise levels specified in section H36.305(a)(1) of appendix H of this
part where the demonstration of compliance is under appendix H of this
part. The tradeoff provisions under section H36.305(b) of appendix H of this
part may not be used to increase any
Stage 1 noise level beyond these limits.
If an applicant chooses to demonstrate
compliance under appendix J of this
part, for each Stage 1 helicopter prior
to a change in type design, the helicopter noise levels may not, after a
change in type design, exceed the Stage
2 noise levels specified in section
J36.305(a) of appendix J of this part.
(c) Stage 2 helicopters. For each helicopter that is Stage 2 prior to a change

in type design, after a change in type
design the helicopter must either:
(1) Remain a Stage 2 helicopter; or
(2) Comply with Stage 3 requirements
and remain a Stage 3 helicopter thereafter.
(d) Stage 3 helicopters. For a helicopter that is a Stage 3 helicopter prior
to a change in type design, the helicopter must remain a Stage 3 helicopter after a change in type design.
[Doc. No. 26910, 57 FR 42854, Sept. 16, 1992, as
amended by Amdt. 36-25, 69 FR 31234, June 2,
2004; Amdt. 36-30, 79 FR 12044, Mar. 4, 2014]

Section 36.13 Acoustical
aircraft.

change:

The following requirements apply to
tiltrotors in any category for which an
acoustical change approval is applied
for under Section 21.93(b) of this chapter on or
after March 11, 2013:
(a) In showing compliance with Appendix K of this part, noise levels must
be measured, evaluated, and calculated
in accordance with the applicable procedures and conditions prescribed in
Appendix K of this part.
(b) Compliance with the noise limits
prescribed in section K4 (Noise Limits)
of Appendix K of this part must be
shown in accordance with the applicable provisions of sections K2 (Noise
Evaluation Measure), K3 (Noise Measurement Reference Points), K6 (Noise
Certification Reference Procedures),
and K7 (Test Procedures) of Appendix K
of this part.
(c) After a change in type design,
tiltrotor noise levels may not exceed
the limits specified in Section 36.1103.
[Amdt. 36-29, 78 FR 1139, Jan. 8, 2013]

Subpart B - Transport Category
Large Airplanes and Jet Airplanes
Section 36.101 Noise measurement and evaluation.
For transport category large airplanes and jet airplanes, the noise generated by the airplane must be measured and evaluated under appendix A of
this part or under an approved equivalent procedure.
[Amdt. 36-54, 67 FR 45212, July 8, 2002]

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