Data / Federal rules / 2025-11449
Airworthiness Directives; Bell Textron Canada Limited Helicopters
The Federal Aviation Administration published this final rule in the Federal Register on June 23, 2025. It took effect on July 8, 2025.
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What the agency says
The FAA is adopting a new airworthiness directive (AD) for all Bell Textron Canada Limited (BTCL) Model 407 and 427 helicopters. This AD was prompted by a report that certain expandable blade bolts installed on the main rotor blade may not have received the correct heat treatment, which could result in stress corrosion cracking of the expandable blade bolts. This AD requires removing the expandable blade bolts from service and replacing them with a part eligible for installation. This AD also prohibits the installation of an affected expandable blade bolt on any helicopter. The FAA is issuing this AD to address the unsafe condition on these products.
Key facts
- Document number
- 2025-11449
- Type
- Final rule
- Action
- Final rule; request for comments
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- June 23, 2025
- Takes effect
- July 8, 2025
- Dates
- This AD is effective July 8, 2025.
- Docket
- Docket No. FAA-2025-1111; Project Identifier MCAI-2025-00675-R; Amendment 39-23067; AD 2025-13-01
- Regulation ID (RIN)
- 2120-AA64
- Code of Federal Regulations
- 14 CFR 39
- Topics
- Air transportation; Aircraft; Aviation safety; Incorporation by reference; Safety
- Pages
- 4
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Everything from the Federal Aviation Administration · Rules on air transportation · Rules on aircraft · Rules on aviation safety · Published in June 2025
Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.