14 CFR 27.907 - Engine vibration.
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(a) Each engine must be installed to prevent the harmful vibration of any part of the engine or rotorcraft.
(b) The addition of the rotor and the rotor drive system to the engine may not subject the principal rotating parts of the engine to excessive vibration stresses. This must be shown by a vibration investigation.
Title 14 published on 2015-01-01.
No entries appear in the Federal Register after this date, for 14 CFR Part 27.