14 CFR 33.63 - Vibration.
Each engine must be designed and constructed to function throughout its declared flight envelope and operating range of rotational speeds and power/thrust, without inducing excessive stress in any engine part because of vibration and without imparting excessive vibration forces to the aircraft structure.
[Doc. No. 28107, 61 FR 28433, June 4, 1996]
Title 14 published on 2014-01-01
no entries appear in the Federal Register after this date.