TCDS, STC and PMA
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A Supplemental Type Certificate (STC) is a document issued by the Federal Aviation Administration approving a product (aircraft, engine, or propeller) modification. The STC defines the product design change, states how the modification affects the existing type design, and lists serial number effectivity. It also identifies the certification basis listing specific regulatory compliance for the design change. Information contained in the certification basis is helpful for those applicants proposing subsequent product modifications and evaluating certification basis compatibility with other STC modifications.
Parts Manufacturer Approval (PMA) is both a design approval and a production approval. It is issued for the production of modification or replacement parts, which includes materials, parts, processes, and appliances. Procedures for evaluation, approval, and maintenance of PMA are described in Order 8110.42.