{"data":{"id":"us/14-cfr-121.251","jurisdiction":"us","citation":"14 CFR 121.251","heading":"Engine accessory section diaphragm.","body":"Unless equivalent protection can be shown by other means, a diaphragm that complies with § 121.247 must be provided on air-cooled engines to isolate the engine power section and all parts of the exhaust system from the engine accessory compartment.","path":["Title 14—Aeronautics and Space","CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER G—AIR CARRIERS AND OPERATORS FOR COMPENSATION OR HIRE: CERTIFICATION AND OPERATIONS","PART 121—OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS","Subpart J—Special Airworthiness Requirements"],"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":"4c0d2c3e232f6b5eace72b7e267045d58752feda558ee56874116171aa635702","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-121.249","next":"us/14-cfr-121.253"},"notice":"GroundRules: Original legal text. Not legal advice."}