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Regulations last checked for updates: Dec 16, 2025
Title 14 - Aeronautics and Space last revised: Nov 03, 2025
All Titles
Title 14
Chapter I
Part 21
Subpart D - Subpart D—Changes to Type Certificates
§ 21.91 - Applicability.
§ 21.93 - Classification of changes in type design.
§ 21.95 - Approval of minor changes in type design.
§ 21.97 - Approval of major changes in type design.
§ 21.99 - Required design changes.
§ 21.101 - Designation of applicable regulations.
authority:
42 U.S.C. 7572
;
49 U.S.C. 106
(f), 40105, 40113, 44701-44702, 44704, 44707, 44709, 44711, 44713, 44715, 45303
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