14 C.F.R. § 27.601 Design.
Title 14 - Aeronautics and Space
(a) The rotorcraft may have no design features or details that experience has shown to be hazardous or unreliable. (b) The suitability of each questionable design detail and part must be established by tests.
Title 14: Aeronautics and Space
PART 27—AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT
Subpart D—Design and Construction
General
§ 27.601 Design.
