C.F.R. » Title 14 » CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › SUBCHAPTER C—AIRCRAFT › PART 29—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT › Subpart B—Flight

14 C.F.R. § 29.241

Ground resonance

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The rotorcraft may have no dangerous tendency to oscillate on the ground with the rotor turning.