14 C.F.R. § 29.81 Landing distance: Category A.
Title 14 - Aeronautics and Space
The horizontal distance required to land and come to a complete stop (or to a speed of approximately 3 knots for water landings) from a point 50 ft above the landing surface must be determined from the approach and landing paths established in accordance with §29.79. [Doc. No. 24802, 64 FR 45338, Aug. 19, 1999]
Title 14: Aeronautics and Space
PART 29—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT
Subpart B—Flight
Performance
§ 29.81 Landing distance: Category A.