What was found
AIRCRAFT OPERATOR REPORTED A TOTAL LOSS OF OIL PRESSURE AND QUANTITY 20 MINUTES AFTER TAKE OFF FROM LAX. THIS RESULTED IN A IFSD AND AN ATB. INVESTIGATION AT THE ENGINE REPAIR STATION REVEALED THAT ONE OF THE TWELVE RETAINING BOLTS FOR THE NR 7 BEARING WAS MISSING. THE BOLT WAS FOUND IN THE BEARING SCAVENGE LINE. THE BOLT HAD BLOCKED THE PIPE AND CAUSED THE ENGINE TO PUMP ALL OF THE OIL OVERBOARD.