14 C.F.R. § 25.781 Cockpit control knob shape.
Title 14 - Aeronautics and Space
Cockpit control knobs must conform to the general shapes (but not necessarily the exact sizes or specific proportions) in the following figure: [Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25–72, 55 FR 29779, July 20, 1990]
Title 14: Aeronautics and Space
PART 25—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
Subpart D—Design and Construction
Personnel and Cargo Accommodations
§ 25.781 Cockpit control knob shape.
