14 CFR 23.443 - Gust loads.

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§ 23.443 Gust loads.

(a) Vertical surfaces must be designed to withstand, in unaccelerated flight at speed V C, lateral gusts of the values prescribed for V C in § 23.333(c).

(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 VB, VC, VD, and VF. The derived gusts and airplane speeds corresponding to these conditions, as determined by §§ 23.341 and 23.345, must be investigated. The shape of the gust must be as specified in § 23.333(c)(2)(i).

(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);
t = Mean geometric chord of vertical surface (ft.);
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]

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United States Code

Title 14 published on 2015-01-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 14 CFR Part 23 after this date.

  • 2015-12-09; vol. 80 # 236 - Wednesday, December 9, 2015
    1. 80 FR 76379 - Special Conditions: Cirrus Aircraft Corporation, SF50; Auto Throttle
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Final special conditions.
      The effective date of these special conditions is December 9, 2015 and are applicable on December 2, 2015.
      14 CFR Part 23