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§ 25.405
Secondary control system.
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:
Pilot Control Force Limits (Secondary Controls)
Limit pilot forces
*Crank, wheel, or lever
((1 + R) / 3) × 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).
133 in.-lbs.
To be chosen by applicant.
*Limited to flap, tab, stabilizer, spoiler, and landing gear operation controls.