Data / Federal rules / 2025-14713
Special Conditions: CFM International, LEAP-1B Engine Model; Incorporation of Woven Composite Fan Blades
The Federal Aviation Administration published this final rule in the Federal Register on August 4, 2025. It took effect on August 4, 2025. Comments closed on September 18, 2025.
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What the agency says
This action amends Special Condition No. 33-017-SC for the CFM International (CFM) Model LEAP-1B engines. These engines have a novel or unusual design feature associated with the engine fan blades-- incorporation of woven composite fan blades. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These special conditions, as amended, contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.
Key facts
- Document number
- 2025-14713
- Type
- Final rule
- Action
- Final special conditions; request for comments; amendment
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- August 4, 2025
- Takes effect
- August 4, 2025
- Comments due
- September 18, 2025
- Dates
- This action is effective on CFM International on August 4, 2025. Send comments on or before September 18, 2025.
- Docket
- Docket No. FAA-2015-4220; Special Conditions No. 33-017-SC
- Code of Federal Regulations
- 14 CFR 33
- Topics
- Aircraft; Aviation safety; Reporting and recordkeeping requirements
- Pages
- 3
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