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Advertisement Sec. 27.659 - Mass balance. (a) The rotors and blades must be mass balanced as necessary to -- (1) Prevent excessive vibration; and (2) Prevent flutter at any speed up to the maximum forward speed. (b) The structural integrity of the mass balance installation must be substantiated. [Amdt. 27-2, 33 FR 963, Jan. 26, 1968]
Previous: Sec. 27.653 - Pressure venting and drainage of rotor blades.
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