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§ 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]