What was found
CAPTAIN REPORTED THAT DURING APPROACH, THE LEFT ENGINE OIL QUANTITY DECREASED TO 3 QTS WITH ENGINE PARAMETERS NORMAL. THE AIRCRAFT WAS SENT TO THE HANGAR AND MAINTENANCE PERSONNEL PERFORMED LEFT ENGINE LEAK CHECK IAW AMM 71-00-00-700-823, AMM 79-00-00-200-800, FIM 79-05 TASK 809 PROCEDURE, DETECTING OIL LEAK IN THE LEFT IDG DRAIN AND LEFT GENERATOR DRAIN; SO THE LEFT IDG AND GENERATOR CARBON SEALS WERE REPLACED AND ENGINE TEST WAS PERFORMED IAW AMM 79-21-07 AND AMM 72-60-01, ALL CORRECT.