14 CFR § 21.500

That country or jurisdiction is subject to the provisions of an agreement with the United States for the acceptance of that product;

That product is marked in accordance with part 45 of this chapter; and

The holder or licensee of a U.S. type certificate for that product furnishes with each such aircraft engine or propeller imported into the United States, an export airworthiness approval issued in accordance with the provisions of that agreement certifying that the individual aircraft engine or propeller—

Conforms to its U.S. type certificate and is in condition for safe operation; and

Has been subjected by the manufacturer to a final operational check.