14 CFR 25.415 - Ground gust conditions.

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§ 25.415 Ground gust conditions.
(a) The control system must be designed as follows for control surface loads due to ground gusts and taxiing downwind:
(1) The control system between the stops nearest the surfaces and the cockpit controls must be designed for loads corresponding to the limit hinge moments H of paragraph (a)(2) of this section. These loads need not exceed—
(i) The loads corresponding to the maximum pilot loads in § 25.397(c) for each pilot alone; or
(ii) 0.75 times these maximum loads for each pilot when the pilot forces are applied in the same direction.
(2) The control system stops nearest the surfaces, the control system locks, and the parts of the systems (if any) between these stops and locks and the control surface horns, must be designed for limit hinge moments H, in foot pounds, obtained from the formula,
H=.0034KV2cS, where—
V=65 (wind speed in knots)
K=limit hinge moment factor for ground gusts derived in paragraph (b) of this section.
c=mean chord of the control surface aft of the hinge line (ft);
S=area of the control surface aft of the hinge line (sq ft);
(b) The limit hinge moment factor K for ground gusts must be derived as follows:
Surface K Position of controls
1 A positive value of K indicates a moment tending to depress the surface, while a negative value of K indicates a moment tending to raise the surface.
(a) Aileron 0.75 Control column locked or lashed in mid-position.
(b) ......do 1 1 ±0.50 Ailerons at full throw.
(c) Elevator 1 1 ±0.75 (c) Elevator full down.
(d) ......do 1 1 ±0.75 (d) Elevator full up.
(e) Rudder 0.75 (e) Rudder in neutral.
(f) ......do 0.75 (f) Rudder at full throw.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25-72, 55 FR 29776, July 20, 1990; Amdt. 25-91, 62 FR 40705, July 29, 1997]

Title 14 published on 2014-01-01

The following are only the Rules published in the Federal Register after the published date of Title 14.

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  • 2014-09-12; vol. 79 # 177 - Friday, September 12, 2014
    1. 79 FR 54571 - Special Conditions: Bombardier Aerospace, Models BD-500-1A10 and BD-500-1A11 Series Airplanes; Automatic Speed Protection for Design Dive Speed
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Final special conditions.
      Effective Date: October 14, 2014.
      14 CFR Part 25

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United States Code

Title 14 published on 2014-01-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 14 CFR 25 after this date.

  • 2014-09-12; vol. 79 # 177 - Friday, September 12, 2014
    1. 79 FR 54571 - Special Conditions: Bombardier Aerospace, Models BD-500-1A10 and BD-500-1A11 Series Airplanes; Automatic Speed Protection for Design Dive Speed
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Final special conditions.
      Effective Date: October 14, 2014.
      14 CFR Part 25