SECTION	Title	Time
§ 38.19	§ 38.19 Change criteria.	July 7, 2025
§ 38.21	§ 38.21 Approval before compliance testing.	July 7, 2025
§ 38.23	§ 38.23 Manual information and limitations.	July 7, 2025
Appendix A	Appendix A to Part 38—Determination of Airplane Fuel Efficiency Metric Value	July 7, 2025
§ 38.1	§ 38.1 Applicability.	July 24, 2026
§ 38.3	§ 38.3 Definitions.	July 24, 2026
§ 38.4	§ 38.4 Compatibility with airworthiness requirements.	July 24, 2026
§ 38.5	§ 38.5 Exemptions.	July 24, 2026
§ 38.7	§ 38.7 Incorporation by reference.	July 24, 2026
§ 38.9	§ 38.9 Relationship to other regulations.	July 24, 2026
§ 38.11	§ 38.11 Fuel efficiency metric.	July 24, 2026
§ 38.13	§ 38.13 Specific air range.	July 24, 2026
§ 38.15	§ 38.15 Reference geometric factor.	July 24, 2026
§ 38.17	§ 38.17 Fuel efficiency limits.	July 24, 2026
§ 38.19	§ 38.19 Change criteria.	July 24, 2026