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Federal Aviation Regulations

Sec. 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)

ControlLimit 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).
Twist133 in.–lbs.
Push-pullTo be chosen by applicant.

*Limited to flap, tab, stabilizer, spoiler, and landing gear operation controls.

NEXT: Sec. 25.407 - Trim tab effects.
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