{"data":{"id":"us/14-cfr-27.969","jurisdiction":"us","citation":"14 CFR 27.969","heading":"Fuel tank expansion space.","body":"Each fuel tank or each group of fuel tanks with interconnected vent systems must have an expansion space of not less than 2 percent of the tank capacity. It must be impossible to fill the fuel tank expansion space inadvertently with the rotorcraft in the normal ground attitude.","path":["Title 14—Aeronautics and Space","CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—AIRCRAFT","PART 27—AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT","Subpart E—Powerplant"],"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":"c4c6bd28244db85dc21c323173fa0103095ce80a49bd46e295ff34dec7529042","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-27.967","next":"us/14-cfr-27.971"},"notice":"GroundRules: Original legal text. Not legal advice."}