View all text of Subjgrp 256 [§ 29.653 - § 29.663]
§ 29.659 - Mass balance.
(a) The rotor 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.