What was found
INSPECTION TYPE: C, RT BS 1480 BULKHEAD - ONE EACH FASTENER NR 5 WAS CRACKED AT EXTENSION FITTING AREA RUNNING AFT APPROX 0.040 INCH LONG. REF RS R53-43-35093 & EO B747-5310-19423A RT BS 1480 BULKHEAD SPLICE EXTENSION FTG NR 5 HOLE OVERSIZED TO 0.625 INCH & HFEC CONFIRMED NO CRACK REPAIR BUSHING FABRICATED AND INSTALLED NR 5 BOLT REPLACED THE HOLE DIAMETER EDGE/END MARGIN REF RS TABLE 1. THE BS 1480 BULKHEAD SPLICE HOLES 1 TO 26 REQUIRED REPEAT INSPECTION EVERY 6000 FLT CYCS PER SB747-53A2390.