What was found
AS PART OF TROUBLESHOOTING FOR AN ENGINE OIL QUANTITY PROBLEM, OIL PLUG, WAS FOUND MISSING FROM THE ENGINE DRIVEN COMPRESSOR DRIVE ASSEMBLY. ALLISON P/N 6854702. OIL PLUG WAS RETRIEVED FROM THE REDUCTION GEARBOX LOW POINT DRAIN. OIL PLUG IS PRESS-FIT INTO DRIVE ASSEMBLY SHAFT AT MANUFACTURE, AND SEPARATED FROM SHAFT FOR UNKOWN REASONS. REDUCTION GEARBOX SPLIT, INSPECTED, REPAIRED AND RETURNED TO SERVICE. ENGINE TSO 865.8.