C.F.R. » Title 14 » CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › SUBCHAPTER C—AIRCRAFT › PART 27—AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT › Subpart C—Strength Requirements

14 C.F.R. § 27.341

Gust loads

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The rotorcraft must be designed to withstand, at each critical airspeed including hovering, the loads resulting from a vertical gust of 30 feet per second.