Data / Federal rules / 2025-23258
Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
The Federal Aviation Administration published this proposed rule in the Federal Register on December 18, 2025. Comments closed on February 2, 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 (AHD) Model MBB-BK 117 A-1, MBB-BK 117 A-3, MBB-BK 117 A-4, MBB-BK 117 B-1, MBB-BK 117 B-2, and MBB-BK 117 C-1 helicopters. This proposed AD was prompted by a report of a main rotor head (MRH) having the same part number (P/N) and serial number (S/N) as another MRH due to incorrect modification instructions where the modified part serial number was not re-identified and the MRH can be operated with the wrong associated log card if accidently interchanged. This proposed AD would require performing a one-time consistency check of the P/N and S/N of the MRH, performing corrective actions if applicable, determining if the MRH has been modified, and re-identifying the modified MRH. The proposed AD would also allow replacing the MRH as an optional action and would prohibit the installation of an affected MRH on any helicopter. The FAA is proposing this AD to address the unsafe condition on these products.
Key facts
- Document number
- 2025-23258
- Type
- Proposed rule
- Action
- Notice of proposed rulemaking (NPRM)
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- December 18, 2025
- Comments due
- February 2, 2026
- Dates
- The FAA must receive comments on this NPRM by February 2, 2026.
- Docket
- Docket No. FAA-2025-5393; Project Identifier MCAI-2025-00157-R
- 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 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.