Data / Federal rules / 2026-13365
Airworthiness Directives; MD Helicopters, LLC Helicopters
The Federal Aviation Administration published this proposed rule in the Federal Register on July 1, 2026. Comments closed on August 17, 2026.
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What the agency says
The FAA proposes to adopt a new airworthiness directive (AD) for certain MD Helicopters, LLC (MDHI) Model 369D, 369E, 369F, 369FF, 369H, and 500N helicopters. This proposed AD was prompted by a report of mechanical damage to the main transmission drive shaft coupling (coupling). This proposed AD would require a one-time visual inspection of the couplings for cracks of the splines and, depending on the results, replacement of the couplings. The FAA is proposing this AD to address the unsafe condition on these products.
Key facts
- Document number
- 2026-13365
- Type
- Proposed rule
- Action
- Notice of proposed rulemaking (NPRM)
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- July 1, 2026
- Comments due
- August 17, 2026
- Dates
- The FAA must receive comments on this proposed AD by August 17, 2026.
- Docket
- Docket No. FAA-2026-4666; Project Identifier AD-2025-01677-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 July 2026
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.