What was found
NR 1 ENG EXCESSIVE OIL USAGE OR LOSS, AT ENG START HAD 19 QTS AFTER ENGINE START WAS APPROX 17 QTS. AT 1.5 HRS INTO FLT READ 11 QTS AND STILL DROPPING 7 QTS AT TOUCHDOWN 4 HRS 10 MIN TOTAL TIME. REMOVED NR 10 DRIVE ADAPTER, FOUND O-RING SEAL ON IDLER GEAR SECTION BAD. REMOVED AND REPLACED O-RING. INSTALLED ADAPTER PER DC10-30 MM 72-65-00-8. RECHECKED AREA WITH PRESSURE ADAPTER, NO LEAKS NOTED. REMOVED ADAPTER AND REINSTALLED SHAFTS AND COVERS. REINSTALLED GENERATOR PER DC10-30 MM 24-21-04 AND REINSTALLED CSD PER DC 10-30 MM 24-11-09. RAN ENGINE AT HIGH POWER AND RECHECKED DRAINS, NO LEAKS NOTED.