What was found
ON TAKEOFF, NOTICE SMALL BIRD PASS OVER NOSE AND LEFT WINDSHIELD, TAKEOFF WAS NORMAL. DURING CLIMBOUT, 14,500 FEET, STARTED TO HEAR A LOUD WHINE AND VIBRATION COMING FROM LEFT ENGINE. DIVERTED AND BROUGHT LEFT ENGINE TO FLIGHT IDLE. DESCENT AND LANDING WAS NORMAL. DURING TAXI IN, SHUTDOWN LEFT ENGINE TO PREVENT POSSIBLE DAMAGE. INITIAL INSPECTION AFTER PILOT REPORTED EVENT. REVEALED EXTENSIVE HP COMPRESSOR AND TURBINE DAMAGE WITH HEAVY OIL CONTAMINATION. CONTINUED OPERATION, WOULD RESULT IN TOTAL CATASTROPHIC FAILURE.