Data / Federal rules / 2026-17584
Airworthiness Directives; Lycoming Engines
The Federal Aviation Administration published this final rule in the Federal Register on August 28, 2026. It took effect on September 14, 2026. Comments closed on October 13, 2026.
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What the agency says
The FAA is adopting a new airworthiness directive (AD) for certain Lycoming Engines (Lycoming) Model O-235, O-540, and IO-540 engines with a certain piston pin installed. This AD was prompted by several reports of piston pin failure that resulted in metal particulate contamination in the engine oil and engine failure. This AD requires replacement of the affected piston pin with a part eligible for installation and, for certain engines, oil change and visual inspection of the engine oil filter, oil pressure screen, and oil suction screen for metal particulates. This AD also prohibits the installation of an affected piston pin on any engine. The FAA is issuing this AD to address the unsafe condition on these products.
Key facts
- Document number
- 2026-17584
- Type
- Final rule
- Action
- Final rule; request for comments
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- August 28, 2026
- Takes effect
- September 14, 2026
- Comments due
- October 13, 2026
- Dates
- This AD is effective September 14, 2026.
- Docket
- Docket No. FAA-2026-8789; Project Identifier AD-2026-00678-E; Amendment 39-23454; AD 2026-17-10
- 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 August 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.