14 CFR 23.425 - Gust loads.

Status message

There is 1 rule appearing in the Federal Register for 14 CFR 23. View below or at eCFR (GPOAccess)
§ 23.425 Gust loads.
(a) Each horizontal surface, other than a main wing, must be designed for loads resulting from—
(1) Gust velocities specified in § 23.333(c) with flaps retracted; and
(2) Positive and negative gusts of 25 f.p.s. nominal intensity at V F corresponding to the flight conditions specified in § 23.345(a)(2).
(b) [Reserved]
(c) When determining the total load on the horizontal surfaces for the conditions specified in paragraph (a) of this section, the initial balancing loads for steady unaccelerated flight at the pertinent design speeds VF, VC, and VD must first be determined. The incremental load resulting from the gusts must be added to the initial balancing load to obtain the total load.
(d) In the absence of a more rational analysis, the incremental load due to the gust must be computed as follows only on airplane configurations with aft-mounted, horizontal surfaces, unless its use elsewhere is shown to be conservative:
where—
ΔLht=Incremental horizontal tailload (lbs.);
Kg=Gust alleviation factor defined in § 23.341;
Ude=Derived gust velocity (f.p.s.);
V=Airplane equivalent speed (knots);
aht=Slope of aft horizontal lift curve (per radian)
Sht=Area of aft horizontal lift surface (ft2); and
[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as amended by Amdt. 23-7, 34 FR 13089 Aug. 13, 1969; Amdt. 23-42, 56 FR 353, Jan. 3, 1991]

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.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2014-05-07; vol. 79 # 88 - Wednesday, May 7, 2014
    1. 79 FR 26111 - Special Conditions: Extra Flugzeugproduktions and Vertriebs [Extra] GmbH, EA-300/LC; Acrobatic Category Aerodynamic Stability
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Final special conditions.
      These special conditions are May 7, 2014, and are applicable beginning April 25, 2014.
      14 CFR Part 23

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].

It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.


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 23 after this date.

  • 2014-05-07; vol. 79 # 88 - Wednesday, May 7, 2014
    1. 79 FR 26111 - Special Conditions: Extra Flugzeugproduktions and Vertriebs [Extra] GmbH, EA-300/LC; Acrobatic Category Aerodynamic Stability
      GPO FDSys XML | Text
      DEPARTMENT OF TRANSPORTATION, Federal Aviation Administration
      Final special conditions.
      These special conditions are May 7, 2014, and are applicable beginning April 25, 2014.
      14 CFR Part 23