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. § 27.481

Tail-down landing conditions

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(a) The rotorcraft is assumed to be in the maximum nose-up attitude allowing ground clearance by each part of the rotorcraft.

(b) In this attitude, ground loads are assumed to act perpendicular to the ground.