14 CFR · Part 27
14 CFR § 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.
Reflects the eCFR edition current as of September 29, 2026. Retrieved from ecfr.gov on October 16, 2026.
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