What was found
(CAN) DURING TAKE-OFF & FOLLOWING ROTATION, THE FLIGHT CREW HEARD AN UNUSUAL NOISE FROM THE NR 2 ENGINE AREA. THE FLIGHT CREW OBSERVED ENGINE INSTRUMENT INDICATIONS CONSISTENT WITH AN ENGINE FAILURE & CONDUCTED A SHUTDOWN OF THE NR 2 ENGINE IAW STANDARD OPERATING PROCEDURE. THE AIRCRAFT RETURNED TO THE AIRPORT & LANDED WITHOUT FURTHER INCIDENT. FURTHER INSPECTION BY MAINTENANCE IDENTIFIED THE NR 7 BEARING COVER SEPARATED FROM THE NR 2 ENGINE & SEVERE DAMAGE TO THE POWER TURBINE ASSEMBLY, IT IS PROBABLE THAT THE BEARING COVER LIBERATED ITSELF FROM THE ENGINE DUE TO PT VIBRATION. FOLLOWING REPLACEMENT OF THE NR 2 ENGINE, THE UNSERVICEABLE ENGINE WILL BE SENT TO A REPAIR VENDOR FOR FURTHER INVESTIGATION TO DETERMINE THE ROOT CAUSE OF THE IDENTIFIED FAILURE.