Acoustical change: Propeller-driven small airplanes and propeller-driven commuter category airplanes.

CFR · 2024-01-01 · US · Title 14

For propeller-driven small airplanes in the primary, normal, utility, acrobatic, transport, and restricted categories and for propeller-driven, commuter 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 certificated 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 certificated under this part prior to a change in type design, it may not exceed 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.

official document · source cfr-2024 · id 14:§ 36.9