Section 133.1 - ApplicabilityExcept for aircraft subject to part 107 of this chapter, this part prescribes-
(a) Airworthiness certification rules for rotorcraft used in; and(b) Operating and certification rules governing the conduct of rotorcraft external-load operations in the United States by any person.(c) The certification rules of this part do not apply to-(1) Rotorcraft manufacturers when developing external-load attaching means;(2) Rotorcraft manufacturers demonstrating compliance of equipment utilized under this part or appropriate portions of part 27 or 29 of this chapter;(3) Operations conducted by a person demonstrating compliance for the issuance of a certificate or authorization under this part;(4) Training flights conducted in preparation for the demonstration of compliance with this part; or(5) A Federal, State, or local government conducting operations with public aircraft.(d) For the purpose of this part, a person other than a crewmember or a person who is essential and directly connected with the external-load operation may be carried only in approved Class D rotorcraft-load combinations.Doc. No. 15176, 42 FR 24198, May 12, 1977, as amended by Amdt. 133-9, 51 FR 40707, Nov. 7, 1986; Docket FAA-2015-0150, Amdt. 133-15, 81 FR 42214 , June 28, 2016