What was found
ENGINE LOST SOME POWER ON DESCENT, ONCE THE PLANE LANDED, PILOT REPORTED A METAL TO METAL SOUND. ONCE MAINTENANCE ARRIVED A LARGE AMOUNT OF OIL WAS SEEN AT THE EXHAUST TAILPIPE. AFTER PULLING THE PROPELLER THROUGH, A HYDRAULIC LOCK OCCURED AND AT THAT POINT CREW PLACED THE AIRCRAFT ON A BARGE TO RETURN TO TOWN. AT ENGINE REMOVAL A LARGE AMOUNT OF OIL WAS LEAKING THROUGH THE SUPERCHARGER SECTION OF THE ENGINE AND METAL CONTAMINATES WERE DISCOVERED IN THE OIL SCREEN.