What was found
PHL - FL 1243, DURING CLIMB AT 10,000 FEET, THE NR 1 ENGINE OIL QTY DROPPED RAPIDLY TO ZERO, FOLLOWED BY A DROP IN OIL PRESSURE AND A RISE IN OIL TEMPERATURE. CAPTAIN DECLARED AN EMERGENCY AND SHUT DOWN THE NR 1 ENGINE IN FLIGHT. FLIGHT RETURNED TO FIELD AT PHL AND LANDED WITHOUT FURTHER INCIDENT. TOTAL SINGLE ENGINE TIME WAS 22 MINUTES. MAINTENANCE FOUND THE BUSHING O-RING ON THE NR 1 ENGINE OIL FILTER HOUSING LEAKING/DEFECTIVE. REPLACED SAME ALONG WITH O-RING, P/N'S RD3018 AND MS29513-030 AND ENGINE OIL FILTER P/N 056306-06. SERVICED ENGINE OIL AND RAN ENGINE. NO LEAKS NOTED. (M)