{"data":{"id":"us/14-cfr-38.11","jurisdiction":"us","citation":"14 CFR 38.11","heading":"Fuel efficiency metric.","body":"For each airplane subject to this part, or to determine whether a modification makes an airplane subject to this part under the change criteria of § 38.19, a fuel efficiency metric value must be calculated, using the following equation, rounded to three decimal places:\nWhere:\nThe SAR is determined in accordance with § 38.13, and the RGF is determined in accordance with § 38.15. The fuel efficiency metric value is expressed in units of kilograms of fuel consumed per kilometer.","path":["Title 14—Aeronautics and Space","CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—AIRCRAFT","PART 38—AIRPLANE FUEL EFFICIENCY CERTIFICATION","Subpart B—Determining Fuel Efficiency for Subsonic Airplanes"],"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":"4dece34abe529730e062cf0415f7d37bf00de199c3aad4cea358be60a1677677","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-38.9","next":"us/14-cfr-38.13"},"notice":"GroundRules: Original legal text. Not legal advice."}