{"data":{"id":"us/14-cfr-29.959","jurisdiction":"us","citation":"14 CFR 29.959","heading":"Unusable fuel supply.","body":"The unusable fuel supply for each tank must be established as not less than the quantity at which the first evidence of malfunction occurs under the most adverse fuel feed condition occurring under any intended operations and flight maneuvers involving that tank.","path":["Title 14—Aeronautics and Space","CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—AIRCRAFT","PART 29—AIRWORTHINESS STANDARDS: TRANSPORT 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":"0599f894f2c8de0ef42687fb10d58f33d5cbc9dc95279a60140c748c07428977","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-29.957","next":"us/14-cfr-29.961"},"notice":"GroundRules: Original legal text. Not legal advice."}