What was found
(B-18606) ACFT, DURING DESCENT, CREW REPORTED NR 1 ENGINE LOW OIL PRESSURE/LOW OIL QUANTITY. ENGINE WAS THEN SHUTDOWN. AFTER LANDING, VISUAL INSP WAS PERFORMED AND FOUND OIL TANK EMPTY (OIL CAP CONFIRMED IN PLACE AND SECURED). CHECKED NORMAL, MAIN OIL FILTER CHECKED NORMAL. NO APPARENT EXTERNAL OIL LEAK EXCEPT OIL WETTING IN TURBINE REAR FRAME. OIL TANK SERVICED TO FULL AND PERFORMED DRY MOTORING, NO LEAK FOUND. ENGINE RUN TEST FOR 15 MINUTES (N1 80 PERCENT) AND NO EXTERNAL OIL LEAK WAS FOUND. ENGINE WAS REMOVED FROM SERVICE FOR FURTHER INVESTIGATION.