14 C.F.R. § 29.777 Cockpit controls.
Title 14 - Aeronautics and Space
Cockpit controls must be— (a) Located to provide convenient operation and to prevent confusion and inadvertent operation; and (b) Located and arranged with respect to the pilot's seats so that there is full and unrestricted movement of each control without interference from the cockpit structure or the pilot's clothing when pilots from 5′2&inch; to 6′0&inch; in height are seated.
Title 14: Aeronautics and Space
PART 29—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT
Subpart D—Design and Construction
Personnel and Cargo Accommodations
§ 29.777 Cockpit controls.