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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) > 27.241—Ground resonance.
27.241—Ground resonance.
The rotorcraft may have no dangerous tendency to oscillate on the ground with the rotor turning.