What was found
(CAN) ON FIRST FLIGHT OF DAY, DURING CLIMB OUT AT 15,000 FEET, THE #1 ENGINE INDICATED THERE WAS SIGNIFICANT OIL PRESSURE & QUANTITY LOSS. THE ENGINE WAS SHUTDOWN & THE AIRCRAFT RETURNED TO ITS POINT OF DEPARTURE. PRELIMINARY INSPECTION REVEALED TOTAL LOSS OF OIL, LIGHT METAL DEBRIS IN TAILPIPE & CONDITION 3 FERROUS METAL DEBRIS CAPTURE ON THE FULL FLOW CHIP DETECTOR. THE LP TURBINE (4TH STAGE) HAD MIGRATED AFT ENOUGH TO HAVE ALLOWED TURBINE BLADE RUB/CONTACT WITH THE FORWARD FACE OF THE TAILCONE BULLET. EVIDENCE THUS FAR SUGGESTS A 4/5 BEARING FAILURE.