{"data":{"id":"us/14-cfr-21.613","jurisdiction":"us","citation":"14 CFR 21.613","heading":"Duration.","body":"(a) A TSO authorization or letter of TSO design approval is effective until surrendered, withdrawn, or otherwise terminated by the FAA.\n(b) If a TSO is revised or canceled, the holder of an affected FAA letter of acceptance of a statement of conformance, TSO authorization, or letter of TSO design approval may continue to manufacture articles that meet the original TSO without obtaining a new acceptance, authorization, or approval but must comply with the requirements of this chapter.","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 O—Technical Standard Order Approvals"],"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":"bb7fb3a62b959b4d4db6b189c84b7ef8a46cb5e14440ce6fa6f1303200873628","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-21.611","next":"us/14-cfr-21.614"},"notice":"GroundRules: Original legal text. Not legal advice."}