What was found
DURING FLIGHT, MASTER WARNING ILLUMINATED FOR THE RT ENGINE OIL PRESSURE INDICATION. THE RT ENGINE AUTO-FEATHERED AND THE CREW IAW QRH SHUTDOWN THE ENGINE IN FLIGHT. THE AC THEN MADE AN AIR-TURN-BACK AND DECLARED AN EMERGENCY. THE CREW MADE AN UNEVENTFUL LANDING. MX INSPECTED THE SYSTEM AND FOUND THE OIL PRESSURE ELBOW HAD CRACKED AS A RESULT THE PROP LOST OIL PRESSURE AND WENT INTO A FEATHERED POSITION. MX REPLACED THE ELBOW AND SERVICED, INSPECTED AND RAN THE ENGINE. THE AC WAS FERRIED BACK, AND THE RT ENGINE WAS REPLACED. (K)