Text in force at CS29-12: from CS29-0, effective 14 Nov 2003.
(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 m ass balance installation must be substantiated.
ED Decision 2003/016/RM · Source