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C.F.R.
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Title 14
» CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › SUBCHAPTER C—AIRCRAFT › PART 29—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT › Subpart B—Flight
Any short-period oscillation occurring at any speed from VY to VNE must be positively damped with the primary flight controls free and in a fixed position.