ROLLS-ROYCE 250-C20, -C20B, and -C20R/2 turboshaft engines [Docket No. FAA-2011-0961; Directorate Identifier 2011-NE-22-AD; Amendment 39-17120; AD 2012-14-06] – requires a one-time visual inspection and fluorescent penetrant inspection (FPI) on certain 3rd and 4th stage turbine wheels for cracks in the turbine blades. This AD was prompted by seven cases reported of released turbine blades and shrouds, which led to loss of power and engine inflight shutdowns. FAA is issuing this AD to ...

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