What was found
FLIGHT CREW FIRST NOTED NOISE IN HEADSETS FOLLOWED BY RIGHT ENGINE SURGE/RPM DROP/FIRE WARNING AND HIGH I.T.T. INDICATION. RIGHT ENGINE WAS FEATHERED, FIRE BOTTLE DISCHARGED AND AN UNEVENTFUL LANDING ACCOMPLISHED. MAINTENANCE FOUND RIGHT ENGINE STARTER/GENERATOR COMPLETELY SHEARED FROM ENGINE BY FAILURE OF STARTER/GENERATOR ADAPTER, PN 23065-504. MAINTENANCE SUSPECTS STARTER/GENERATOR FAILED INTERNALLY AND SEIZED. STARTER/GENERATOR DRIVE SHAFT FAILED TO SHEAR CAUSING ADAPTER CASTING TO FAIL. FIRE WARNING WAS FROM OVERHEATED GENERATOR PRIOR TO COMPLETE FAILURE.