{"data":{"id":"us/14-cfr-63.19","jurisdiction":"us","citation":"14 CFR 63.19","heading":"Operations during physical deficiency.","body":"No person may serve as a flight engineer or flight navigator during a period of known physical deficiency, or increase in physical deficiency, that would make him unable to meet the physical requirements for his current medical certificate.","path":["Title 14—Aeronautics and Space","CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER D—AIRMEN","PART 63—CERTIFICATION: FLIGHT CREWMEMBERS OTHER THAN PILOTS","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":"4a26e1451cb06819cada3e1d13460bcd7ce91c5126a3f8bf3e3976c5dcfee9f6","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-63.18","next":"us/14-cfr-63.20"},"notice":"GroundRules: Original legal text. Not legal advice."}