What was found
BULKHEAD DOUBLER UNDER NR 3 TAILROTOR DRIVESHAFT PILLOW BLOCK FOUND CRACKED. CRACKS WERE PROPAGATING FROM THE RADIUS AREA ON BOTH UPPER TABS WERE THE NUT PLATES ARE RIVETED ON. BOTH NUT PLATES HAD PREVIOUSLY BEEN ROUNDED IN THE RADIUS AREA TO REDUCE THE CHANCES OF CRACKING. IT IS POSSIBLE THAT THE OUTSIDE RADIUS ON THE DOUBLER IS TOO LARGE TO FIT IN THE INSIDE RADIUS OF THE BULKHEAD, CREATING AN AREA BETWEEN THE TWO PIECES THAT IS COMPRESSED WHEN THE BOLT IS TIGHTENED INTO THE NUT PLATE AND THERE BY CAUSING THE DOUBLER TO CRACK.