EASA Regulations for Lycoming Engines TVO-435-B1B

Engine - Piston Pin - Replacement / Inspection

The Engine - Piston Pin - Replacement / Inspection is a Federal Aviation Administration (FAA) Airworthiness Directive (AD 2026-22-13) addressing Lycoming Engines Model O-235, O-540, and IO-540 piston pins. It mandates replacement of affected piston pins and, for certain engines, requires oil changes and inspections for metal particulates to prevent engine failure. This directive expands the applicability to additional Lycoming engine models and clarifies the definition of affected piston pins.