(b) Any holder of an air carrier operating certificate under Part 121 of this chapter who is a United States citizen may apply for a Class II provisional airworthiness certificate for transport category aircraft that meet either of the following:
(1) The aircraft has a current Class II provisional type certificate or an amendment thereto.
(2) The aircraft has a current provisional amendment to a type certificate that was preceded by a corresponding Class II provisional type certificate.
(c) An aircraft engine manufacturer who is a United States citizen and who has altered a type certificated aircraft by installing different type certificated engines, manufactured by him within the United States, may apply for a Class I provisional airworthiness certificate for that aircraft, if the basic aircraft, before alteration, was type certificated in the normal, utility, acrobatic, commuter, or transport category.
[Doc. No. 5085, 29 FR 14571, Oct. 24, 1964, as amended by Amdt. 21–59, 52 FR 1836, Jan. 15, 1987; Amdt. 21–79, 66 FR 21066, Apr. 27, 2001]