14 C.F.R. § 23.443 Gust loads.
Title 14 - Aeronautics and Space
(a) Vertical surfaces must be designed to withstand, in unaccelerated flight at speed V (b) In addition, for commuter category airplanes, the airplane is assumed to encounter derived gusts normal to the plane of symmetry while in unaccelerated flight at V (c) In the absence of a more rational analysis, the gust load must be computed as follows:
Where— Lvt=Vertical surface loads (lbs.);
Ude=Derived gust velocity (f.p.s.); ρ=Air density (slugs/cu.ft.); W=the applicable weight of the airplane in the particular load case (lbs.); Svt=Area of vertical surface (ft.2 ); c
avt=Lift curve slope of vertical surface (per radian); K=Radius of gyration in yaw (ft.); lvt=Distance from airplane c.g. to lift center of vertical surface (ft.); g=Acceleration due to gravity (ft./sec.2 ); and V=Equivalent airspeed (knots). [Amdt. 23–7, 34 FR 13090, Aug. 13, 1969, as amended by Amdt. 23–34, 52 FR 1830, Jan. 15, 1987; 52 FR 7262, Mar. 9, 1987; Amdt. 23–24, 52 FR 34745, Sept. 14, 1987; Amdt. 23–42, 56 FR 353, Jan. 3, 1991; Amdt. 23–48, 61 FR 5147, Feb. 9, 1996]
Title 14: Aeronautics and Space
PART 23—AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES
Subpart C—Structure
Vertical Surfaces
§ 23.443 Gust loads.