14 CFR 33.33 - Vibration.

§ 33.33 Vibration.
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 published on 2014-01-01

no entries appear in the Federal Register after this date.

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