CFR > Title 14 - Aeronautics and Space > CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION > SUBCHAPTER C—AIRCRAFT (parts 21 to 50) > PART 27—AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT > SUBPART D—Design and Construction (§27.601 to §27.873) > 27.601—Design.

27.601—Design.

(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.