FAA Federal Aviation Regulations (FARS, 14 CFR)

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 or certified aircraft;

(c) In the case of any product, upon compliance with §§21.133 through 21.163, obtain a production certificate for the type certificated product;

(d) Obtain approval of replacement parts for that product.