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§ 21.45
The holder or licensee of a type certificate for a product may—
(a) In the case of aircraft, upon compliance with §§ 21.173 through 21.189, obtain airworthiness certificates;
(b) In the case of aircraft engines or propellers, obtain approval for installation on certificated aircraft;
(c) In the case of any product, upon compliance with subpart G of this part, obtain a production certificate for the type certificated product;
(d) Obtain approval of replacement parts for that product.
[Doc. No. 5085, 29 FR 14564, Oct. 24, 1964, as amended by Amdt. 21-92, 74 FR 53386, Oct. 16, 2009]