What was found
PILOT WAS PERFORMING A LOW LEVEL SEARCH AND DURING ROUTINE SCAN OF THE INSTRUMENT PANEL, NOTICED THAT THE OIL PRESSURE LIGHT WAS ON AND OIL PRESSURE INDICATOR WAS READING LESS THAN 1 BAR AND TORQUE INDICATION WAS VERY LOW. IMMEDIATELY EXECUTED AN EMERGENCY LANDING AND SHUTDOWN THE ACFT. OBSERVED OIL RUNNING DOWN THE LT & RT SIDES OF THE ACFT FROM THE TRANSMISSION DECK AREAS. PILOT ESTIMATES THAT FROM THE TIME OBSERVED THE OIL PRESSURE LIGHT UNTIL LANDING AND SHUTDOWN WAS LESS THAN ONE MINUTE. THE OIL SUPPLY LINE TO THE INSTALLED OIL FILTER WAS PUNCTURED. PLASTIC 4 LEGGED STANDOFF WAS TIE STRAPPED TO THE HOSE THAT CAUSED THE RUPTURE IN THE SOFT RUBBER HOSE.