What was found
(CAN) AIRCRAFT SUFFERED AN UNCOMMANDED RIGHT ENGINE SHUT DOWN APPROXIMATELY 10 MINUTES INTO THE FLIGHT, PILOT EXECUTED AND ENGINE OUT SHUT DOWN AND FEATHERED THE PROPELLER, THEN DIVERTED. ON OPENING THE RIGHT ENGINE COWLS THE FOLLOWING WAS FOUND: THE TWO RETAINING STUDS (P/N 401963) AND NUTS FOUND SHEARED OFF ALLOWING THE IDLER GEAR SUPPORT (P/N 534728) TO SEPARATE FROM THE ENGINE AND THE IDLER ASM GEAR (P/N 632795 & ACC DRIVER GEAR (P/N 632829) TO DROP DOWN INTO THE REAR ENGINE CASE. CAUSING LOSS OF IGNITION AND ENGINE STOPPAGE IN FLIGHT. OTHER NOTES: ENGINE CAN STILL BE ROTATED BY HAND AND THE STARTER ADAPTER DOES NOT ENGAGE THE ENGINE. (TC# 20180925012)