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CFR > Title 14 - Aeronautics and Space > CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION > SUBCHAPTER C—AIRCRAFT (parts 21 to 50) > PART 27—AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT > SUBPART B—Flight (§27.21 to §27.251) > 27.251—Vibration.
27.251—Vibration.
Each part of the rotorcraft must be free from excessive vibration under each appropriate speed and power condition.