Data / Federal rules / 2025-22623
Airworthiness Directives; Bell Textron Canada Limited Helicopters
The Federal Aviation Administration published this final rule in the Federal Register on December 12, 2025. It took effect on January 16, 2026.
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What the agency says
The FAA is adopting a new airworthiness directive (AD) for certain Bell Textron Canada Limited (Bell) Model 427 helicopters. This AD was prompted by a report of a cracked transmission oil check valve (check valve). This AD requires inspecting and measuring certain check valves and, depending on the results, repetitively inspecting and removing the check valve from service if it has leaks or is cracked. This AD also prohibits installing the affected check valves on any helicopter. The FAA is issuing this AD to address the unsafe condition on these products.
Key facts
- Document number
- 2025-22623
- Type
- Final rule
- Action
- Final rule
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- December 12, 2025
- Takes effect
- January 16, 2026
- Dates
- This AD is effective January 16, 2026.
- Docket
- Docket No. FAA-2025-1727; Project Identifier MCAI-2024-00750-R; Amendment 39-23209; AD 2025-25-01
- Regulation ID (RIN)
- 2120-AA64
- Code of Federal Regulations
- 14 CFR 39
- Topics
- Air transportation; Aircraft; Aviation safety; Incorporation by reference; Safety
- Pages
- 3
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Everything from the Federal Aviation Administration · Rules on air transportation · Rules on aircraft · Rules on aviation safety · Published in December 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.