14 C.F.R. § 21.133 Eligibility.
Title 14 - Aeronautics and Space
(a) Any person may apply for a production certificate if he holds, for the product concerned, a— (1) Current type certificate; (2) Right to the benefits of that type certificate under a licensing agreement; or (3) Supplemental type certificate. (b) Each application for a production certificate must be made in a form and manner prescribed by the Administrator.
Title 14: Aeronautics and Space
PART 21—CERTIFICATION PROCEDURES FOR PRODUCTS AND PARTS
Subpart G—Production Certificates
§ 21.133 Eligibility.