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]
source: Docket No. 3025, 29 FR 7453, June 10, 1964, unless otherwise noted.
cite as: 14 CFR 33.63