What was found
(CAN) HORIZONTAL STABILIZER ATTACHMENT BRACKETS, PN C2-TP-160, DURING A ROUTINE 100 HR INSPECTION, IT WAS FOUND THAT THE RT STABILIZER ATTACHMENT BRACKET C2-TP-160 HAD 2 OF THE 3 ATTACHMENT BOLTS, PN NAS144-14, NUTS MS21042 WERE SPLIT IN HALF AND RESTED BELOW THE ATTACHMENT BOLTS. THIS ACFT STABILIZER WAS PREVIOUSLY REMOVED IN ORDER TO CARRY OUT SB 2/47, REV E AND WAS REINSTALLED WITH NEW HARDWARE. IN REVIEW OF THIS FAILURE, IT WAS DETERMINED THAT THE BROKEN NUTS, PN MS21042 WERE INFERIOR, POSSIBLY BAD BATCH. AS A PRECAUTION MEASURE THIS STABILIZER WAS REMOVED AND AD CF-1991-42-R1 AND THE S/B 47, REV E WAS CARRIED OUT AND INSPECTED, THEN NEW HARDWARE USED, NUTS PN MS21044NS INSTEAD OF MS21042. THERE WAS AN AMO FINDING GENERATED AS A RESULT OF THIS ISSUE AND FORWARDED TO TECH SUPPORT DEPARTMENT FOR THEIR INVESTIGATION.