The FAA has issued an airworthiness directive for certain Lycoming O-235, O-540, and IO-540 aircraft engines due to defective piston pins that could cause engine failure.
According to the agency, AD 2026-17-10 was prompted by multiple reports of piston pin failure resulting in metal particulate contamination of the engine oil and, in some cases, engine failure.
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![Lycoming 540 series engine [Credit: Lycoming Engines]](https://tbh.express/wp-content/uploads/2026/09/FAA-Issues-Lycoming-Engine-AD-Over-Defective-Piston-Pins.comfilesimport2014sitesallfiles_images20140150engines-lycoming.jpeg "FAA Issues Lycoming Engine AD Over Defective Piston Pins")
