FAA Noise and Emissions Requirements for Changes to Type Design. (a) Any determination of an acoustical or emissions change, regardless if the type design change is major or minor, requires further demonstration of compliance. The FAA will follow the procedures in paragraph 2.9.1 when making findings of acoustical or emissions change under 14 CFR 21.93(b) & (c). (b) A technical substantiation must be provided to the FAA to determine whether or not the changes may be considered an acoustic or emissions changes for type design changes that: (1) have any effect on the performance characteristics of the aircraft, (e.g. drag, weight, lift, power, RPM, etc.); (2) add or modify any externally radiating noise sources, (e.g. APU operation, fuselage distensions, wing extensions, rigging changes, hollow cavities in landing gear or airframe, etc.); and/or (3) modify the engine(s), nacelle(s), propeller (s), or rotor system. (c) Technical substantiation is not required for type design changes that have no possibility of affecting the noise or emissions certification levels,
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Sources: Technical Implementation Procedures, Technical Implementation Procedures
FAA Noise and Emissions Requirements for Changes to Type Design. (a) Any determination of an acoustical or emissions change, regardless if the type design change is major or minor, requires further demonstration of compliance. The FAA will follow the procedures in paragraph 2.9.1 when making findings of acoustical or emissions change under 14 CFR 21.93(b) & (c).
(b) A technical substantiation must be provided to the FAA to determine whether or not the changes may be considered an acoustic or emissions changes for type design changes that:
: (1) have any effect on the performance characteristics of the aircraft, (e.g. drag, weight, lift, power, RPM, etc.);
; (2) add or modify any externally radiating noise sources, (e.g. APU operation, fuselage distensions, wing extensions, rigging changes, hollow cavities in landing gear or airframe, etc.); and/or
and/or (3) modify the engine(s), nacelle(s), propeller (s), or rotor system.
(c) Technical substantiation is not required for type design changes that have no possibility of affecting the noise or emissions certification levels,, 3.
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Sources: Technical Implementation Procedures