14 C.F.R. § 25.399 Dual control system.
Title 14 - Aeronautics and Space
(a) Each dual control system must be designed for the pilots operating in opposition, using individual pilot forces not less than— (1) 0.75 times those obtained under §25.395; or (2) The minimum forces specified in §25.397(c). (b) The control system must be designed for pilot forces applied in the same direction, using individual pilot forces not less than 0.75 times those obtained under §25.395.
Title 14: Aeronautics and Space
PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
Subpart C—Structure
Control Surface and System Loads
§ 25.399 Dual control system.
