14 C.F.R. § 25.405 Secondary control system.
Title 14 - Aeronautics and Space
Secondary controls, such as wheel brake, spoiler, and tab controls, must be designed for the maximum forces that a pilot is likely to apply to those controls. The following values may be used:
Title 14: Aeronautics and Space
PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
Subpart C—Structure
Control Surface and System Loads
§ 25.405 Secondary control system.
Pilot Control Force Limits (Secondary Controls)------------------------------------------------------------------------ Control Limit pilot forces------------------------------------------------------------------------Miscellaneous: *Crank, wheel, or lever................. ((1 + R) / 3) x 50 lbs., but not less than 50 lbs. nor more than 150 lbs. (R=radius). (Applicable to any angle within 20° of plane of control). Twist................................... 133 in.-lbs. Push-pull............................... To be chosen by applicant.------------------------------------------------------------------------*Limited to flap, tab, stabilizer, spoiler, and landing gear operation controls.
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