What was found
OIL LOSS CAUSED NUMBER 1 ENGINE SHUT DOWN 2 HOURS 20 MINUTES AFTER TAKEOFF WHEN PILOTS CAUTION PANEL OIL PRESSURE WARNING LIGHT ILLUMINATED AND INDICATED PRESSURE FLUCUATING BETWEEN 30 AND 35 PSI. FOUND OIL LOSS DUE TO TANK FILLER CAP COCKED ON FILLER NECK AND NOT SEALING. PERFORMED ENGINE INSPECTION PER BAC MM 72-00-00, RESERVICED ENGINE OIL SYSTEM PER BAC MM 12-13-03, REPLACED O-RING ON FILLER CAP PER BAC MM 79-11-04, REINSTALLED CAP AND PERFORMED LEAK CHECK.