StacksVerified U.S. regulatory reference

14 CFR §36.9

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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:
  1. (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.
  2. (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. (1)The noise limit specified in § 36.501 of this part, or
    2. (2)The noise level created prior to the change in type design, measured and corrected as prescribed in § 36.501 of this part.