What was found
AIRCRAFT IN FOR ROUTINE (SCHEDULED) 100 HOUR INSPECTION. STARTER ADAPTERS WERE REMOVED FROM BOTH ENGINES, AND INSPECTED IAW TCM SB NR CS894-4A. THE ADAPTER ASSY AND CRANKSHAFT GEAR ON THE NR 2 ENGINE (ITEM 3) DID NOT PASS INSPECTION CRITERIA OUTLINED, (DEEP SPALLING ON VARIOUS TEETH). UNIT WAS REPLACED WITH SERVICEABLE UNIT. BOTH ADAPTER ASSY'S ARE CURRENT DESIGN UNITS AND PER SB'S, NO FURTHER INSPECTIONS ARE REQUIRED UPON INSTALLATION UNTIL TBO, (OVERHAUL).