{"data":{"id":"us/14-cfr-21.1","jurisdiction":"us","citation":"14 CFR 21.1","heading":"Applicability and definitions.","body":"(a) This part prescribes—\n(1) Procedural requirements for issuing and changing—\n(i) Design approvals;\n(ii) Production approvals;\n(iii) Airworthiness certificates; and\n(iv) Airworthiness approvals;\n(2) Rules governing applicants for, and holders of, any approval or certificate specified in paragraph (a)(1) of this section; and\n(3) Procedural requirements for the approval of articles.\n(b) For the purposes of this part—\n(1) Airworthiness approval means a document, issued by the FAA for an aircraft, aircraft engine, propeller, or article, which certifies that the aircraft, aircraft engine, propeller, or article conforms to its approved design and is in a condition for safe operation, unless otherwise specified;\n(2) Article means a material, part, component, process, or appliance;\n(3) Commercial part means an article that is listed on an FAA-approved Commercial Parts List included in a design approval holder's Instructions for Continued Airworthiness required by § 21.50;\n(4) Design approval means a type certificate (including amended and supplemental type certificates) or the approved design under a PMA, TSO authorization, letter of TSO design approval, or other approved design;\n(5) Interface component means an article that serves as a functional interface between an aircraft and an aircraft engine, an aircraft engine and a propeller, or an aircraft and a propeller. An interface component is designated by the holder of the type certificate or the supplemental type certificate who controls the approved design data for that article;\n(6) Product means an aircraft, aircraft engine, or propeller;\n(7) Production approval means a document issued by the FAA to a person that allows the production of a product or article in accordance with its approved design and approved quality system, and can take the form of a production certificate, a PMA, or a TSO authorization;\n(8) State of Design means the country or jurisdiction having regulatory authority over the organization responsible for the design and continued airworthiness of a civil aeronautical product or article;\n(9) State of Manufacture means the country or jurisdiction having regulatory authority over the organization responsible for the production and airworthiness of a civil aeronautical product or article.\n(10) Supplier means a person at any tier in the supply chain who provides a product, article, or service that is used or consumed in the design or manufacture of, or installed on, a product or article.","path":["Title 14—Aeronautics and Space","CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—AIRCRAFT","PART 21—CERTIFICATION PROCEDURES FOR PRODUCTS AND ARTICLES","Subpart A—General"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-14.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:20Z","sha256":"0bbcfe820574abd56c7a893b77de65f726784d5dd4262171bb2f5b70363e06ad","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-special-federal-aviation-regulation-no.-88-part-21","next":"us/14-cfr-21.2"},"notice":"GroundRules: Original legal text. Not legal advice."}