Current through May 31, 2024
Section 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