14 C.F.R. § 23.369 Rear lift truss.
Title 14 - Aeronautics and Space
(a) If a rear lift truss is used, it must be designed to withstand conditions of reversed airflow at a design speed of— V=8.7 √(W/S) + 8.7 (knots), where W/S=wing loading at design maximum takeoff weight. (b) Either aerodynamic data for the particular wing section used, or a value of C [Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as amended by Amdt. 23–7, 34 FR 13089, Aug. 13, 1969; 34 FR 17509, Oct. 30, 1969; Amdt. 23–45, 58 FR 42160, Aug. 6, 1993; Amdt. 23–48, 61 FR 5145, Feb. 9, 1996]
Title 14: Aeronautics and Space
PART 23—AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES
Subpart C—Structure
Flight Loads
§ 23.369 Rear lift truss.