14 CFR § 21.6

Except as specified in paragraphs (b) and (c) of this section, no person may manufacture a new aircraft, aircraft engine, or propeller based on a type certificate unless the person—

Is the holder of the type certificate or has a licensing agreement from the holder of the type certificate to manufacture the product; and

Meets the requirements of subpart F or G of this part.

A person may manufacture one new aircraft based on a type certificate without meeting the requirements of paragraph (a) of this section if that person can provide evidence acceptable to the FAA that the manufacture of the aircraft by that person began before August 5, 2004.

The requirements of this section do not apply to—

New aircraft imported under the provisions of §§ 21.183(c), 21.184(b), or 21.185(c); and

New aircraft engines or propellers imported under the provisions of § 21.500.