Data / Federal rules / 2026-11506
Airworthiness Directives; Hélicoptères Guimbal Helicopters
The Federal Aviation Administration published this final rule in the Federal Register on June 9, 2026. It took effect on June 24, 2026. Comments closed on July 24, 2026.
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What the agency says
The FAA is adopting a new airworthiness directive (AD) for all H[eacute]licopt[egrave]res Guimbal (HG) Model Cabri G2 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 that was received of a crack on the main rotor (MR) mast after the crew reported an abnormal increase of vibration. This AD requires inspecting the MR mast for cracks and corrosion pitting, and depending on the results of the inspection, accomplishing corrective actions. This AD also requires modifying the MR mast, which includes applying corrosion protection to the MR mast, reporting the inspection results and prohibiting the installation of a certain main gear box (MGB), unless certain requirements are met. The FAA is issuing this AD to address the unsafe condition on these products.
Key facts
- Document number
- 2026-11506
- Type
- Final rule
- Action
- Final rule; request for comments
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- June 9, 2026
- Takes effect
- June 24, 2026
- Comments due
- July 24, 2026
- Dates
- This AD is effective June 24, 2026. Emergency AD 2026-10-51, issued on May 15, 2026, which contained the requirements of this amendment, was effective with actual notice.
- Docket
- Docket No. FAA-2026-4650; Project Identifier MCAI-2026-00514-R; Amendment 39-23370; AD 2026-10-51
- 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 June 2026
Read from the Federal Register API, last updated 2026-10-24. 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.