§ 33.33. Vibration.
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/us/cfr/t14/s§ 33.33·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
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.