{"data":{"id":"us/14-cfr-21.91","jurisdiction":"us","citation":"14 CFR 21.91","heading":"Applicability.","body":"This subpart prescribes procedural requirements for the approval of changes to type certificates.","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 D—Changes to Type Certificates"],"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":"6c077a57934b1f5e140100ed810b8c434cdd5c65fa969d2dfcf277dbe6fba90f","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-21.85","next":"us/14-cfr-21.93"},"notice":"GroundRules: Original legal text. Not legal advice."}