14 C.F.R. § 23.351 Yawing conditions.
Title 14 - Aeronautics and Space
The airplane must be designed for yawing loads on the vertical surfaces resulting from the loads specified in §§23.441 through 23.445. [Doc. No. 4080, 29 FR 17955, Dec. 18, 1964; 30 FR 258, Jan. 9, 1965, as amended by Amdt. 23–42, 56 FR 352, Jan. 3, 1991]
Title 14: Aeronautics and Space
PART 23—AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES
Subpart C—Structure
Flight Loads
§ 23.351 Yawing conditions.

