Data / Federal rules / 2026-08324
Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters
The Federal Aviation Administration published this final rule in the Federal Register on April 29, 2026. It took effect on May 14, 2026. Comments closed on June 15, 2026.
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What the agency says
The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH (AHD) Helicopters Model MBB-BK 117 D-3 helicopters. The FAA previously sent this AD as an emergency AD to all known U.S. owners and operators of these helicopters. This AD was prompted by a report of a crack on the affected part, which was detected after the crew reported increased vibration of the helicopter. This AD requires inspecting the rotor hub-shaft for a crack and depending on the inspection results, replacing any rotor hub-shaft that has any cracks and reporting information after accomplishment of the replacement. This AD also prohibits installing any affected rotor hub- shaft on any helicopter, unless certain requirements are met. The FAA is issuing this AD to address the unsafe condition on these products.
Key facts
- Document number
- 2026-08324
- Type
- Final rule
- Action
- Final rule; request for comments
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- April 29, 2026
- Takes effect
- May 14, 2026
- Comments due
- June 15, 2026
- Dates
- This AD is effective May 14, 2026. Emergency AD 2026-08-51, issued on April 16, 2026, which contained the requirements of this amendment, was effective with actual notice.
- Docket
- Docket No. FAA-2026-3867; Project Identifier MCAI-2026-00403-R; Amendment 39-23249; AD 2026-08-51
- 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 April 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.