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]

NEXT: Sec. 27.661 - Rotor blade clearance.
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