What was found
DURING INSPECTION, FOUND HI-LOCK FASTENER ON RIGHT SIDE OF TUBE STICKING OUT APPROXIMATELY .0625 INCH ON BOTH ENDS. THE FASTENER HAD CORRODED IN THE CENTER AND BROKE. PART NUMBER OF THE FASTENER IS 1528-20 AND THE COLLAR IS NAS1080D8. SUBMITTER RECOMMENDS A ONE TIME INSPECTION AND REPLACEMENT OF ALL HI-LOCKS AND A 300 HOUR INSPECTION OF THE TUBE ASSY FOR CORROSION AND PITTING ON THE INSIDE.