14 C.F.R. § 33.33 Vibration.
Title 14 - Aeronautics and Space
The engine must be designed and constructed to function throughout its normal operating range of crankshaft rotational speeds and engine powers without inducing excessive stress in any of the engine parts because of vibration and without imparting excessive vibration forces to the aircraft structure.
Title 14: Aeronautics and Space
PART 33—AIRWORTHINESS STANDARDS: AIRCRAFT ENGINES
Subpart C—Design and Construction; Reciprocating Aircraft Engines
§ 33.33 Vibration.
