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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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Title 14
Chapter I
Part 38
Subpart B - Subpart B—Determining Fuel Efficiency for Subsonic Airplanes
§ 38.11 - Fuel efficiency metric.
§ 38.13 - Specific air range.
§ 38.15 - Reference geometric factor.
§ 38.17 - Fuel efficiency limits.
§ 38.19 - Change criteria.
§ 38.21 - Approval before compliance testing.
§ 38.23 - Manual information and limitations.
Appendix Appendix A - Appendix A to Part 38—Determination of Airplane Fuel Efficiency Metric Value
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