TC / STC / PMA / TSOA: Before manufacturing a product, an applicant must have a design approval: Type Certificate (TC), Supplemental Type Certificate (STC), amended TC, amended STC as well as a Production Certificate (PC) or other FAA production approval. Before manufacturing a component or spare part (for sale) the applicant must have a Parts Manufacturing Approval (PMA) or a Technical Standard Order (TSO) authorization. These approvals require concurrent work between the FAA Aircraft Certification Office (ACO) and the FAA Manufacturing Inspection District Office (MIDO).