14 CFR Part 21eCFR Sep 29, 2026
Subpart N
Acceptance of Aircraft Engines, Propellers, and Articles for Import
2 Sections§§ 21.500–21.502
§ 21.500 Acceptance of aircraft engines and propellers.
An aircraft engine or propeller manufactured in a foreign country or jurisdiction meets the requirements for acceptance under this subchapter if—
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.
§ 21.502 Acceptance of articles.
An article (including an article produced under a letter of TSO design approval) manufactured in a foreign country or jurisdiction meets the requirements for acceptance under this subchapter if—
That country or jurisdiction is subject to the provisions of an agreement with the United States for the acceptance of that article;
That article is marked in accordance with part 45 of this chapter; and
An export airworthiness approval has been issued in accordance with the provisions of that agreement for that article for import into the United States.