What was found
DURING SCHEDULED MAINTENANCE/ENGINE CHANGE, CONDUCTED THE SCHEDULED 1000 HOUR SPECIAL INSPECTION OF WELDS ON RH ENGINE TRUSS MOUNT ASSEMBLY (AAIP SPEC INSP #25). VERY SMALL (FINE) CRACK APPROX 3/4" LONG WAS OBSERVED WITH 16X MAGNIFYING GLASS PRIOR TO APPLICATION OF DYE PENETRANT. LOCATION-RH SIDE OF MOUNT,INBOARD LOWER WELD CLUSTER - RUNNING NEARLY VERTICALLY ON WELD THAT JOINS THE 3/4" THICK MACHINED MATING BLOCK (HAS THE THREE BOLT HOLES) TO UPPER WRAP AROUND SECTION. VIEWED WITH ENGINE REMOVED AND LOWER YOKE REMOVED FROM TRUSS. ISOLATOR MOUNTS WERE REVIEWED FOR CONDITION, NOT A FACTOR. PROP DYNAMIC BALANCE AND INSPECTION OF BLADE ANGLES TO BE CARRIED OUT PRIOR TO RE-INSTALLATION. 125 OPERATOR.