Data / Federal rules / 2025-21999
Airworthiness Directives; Airbus Helicopters Deutschland GmbH Helicopters
The Federal Aviation Administration published this proposed rule in the Federal Register on December 5, 2025. Comments closed on January 20, 2026.
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What the agency says
The FAA proposes to adopt a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH Model MBB-BK 117 D-3 helicopters. This proposed AD was prompted by a determination that certain bolts installed on the horizontal control rods of the flight controls were not dye penetrant inspected for cracks during manufacturing and thus could lead to bolt failure. This proposed AD would require replacement of affected bolts with bolts that are eligible for installation. This proposed AD would also prohibit installing an affected bolt on any helicopter. The FAA is proposing this AD to address the unsafe condition on these products.
Key facts
- Document number
- 2025-21999
- Type
- Proposed rule
- Action
- Notice of proposed rulemaking (NPRM)
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- December 5, 2025
- Comments due
- January 20, 2026
- Dates
- The FAA must receive comments on this NPRM by January 20, 2026.
- Docket
- Docket No. FAA-2025-5040; Project Identifier MCAI-2022-01516-R
- 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.