What was found
DURING CLIMB AT 10,000 FEET, THE NR 3 ENGINE OIL PRESSURE AND OIL QUANTITY INDICAITONS DROPPED TO ZERO WITH ASSOCIATED LOW OIL PRESSURE LIGHT ILLUMINATION. CREW SHUT DOWN THE NR 3 ENGINE. AIRCRAFT RETURNED TO GEG AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED THE MAIN OIL FILTER, MAG PLUGS, AND REPLACED THE AFT BEARING MAG PLUG.