FAA Federal Aviation Regulations (FARS, 14 CFR)

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 pilots' 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&foot;2&inch; to 6&foot;0&inch; in height are seated.