14 C.F.R. § 23.399 Dual control system.
Title 14 - Aeronautics and Space
(a) Each dual control system must be designed to withstand the force of the pilots operating in opposition, using individual pilot forces not less than the greater of— (1) 0.75 times those obtained under §23.395; or (2) The minimum forces specified in §23.397(b). (b) Each dual control system must be designed to withstand the force of the pilots applied together, in the same direction, using individual pilot forces not less than 0.75 times those obtained under §23.395. [Doc. No. 27805, 61 FR 5145, Feb. 9, 1996]
Title 14: Aeronautics and Space
PART 23—AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES
Subpart C—Structure
Control Surface and System Loads
§ 23.399 Dual control system.
