LYCOMING IO-720-A1B engines [Docket No. FAA-2011-0604; Directorate Identifier 2011-NE-21-AD; Amendment 39-16791; AD 2011-18-09] – Inspect the crankshaft to ensure that the proper parts are installed. This AD, which was prompted by the failure of a crankshaft due to the installation of incorrect...

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