What was found
MAIN CABIN BS 322 FLOORBEAM CORRODED OUT OF LIMITS BETWEEN BS 320 TO BS 324 AND RBL 40 TO RBL 44. MAJOR REPAIR ACCOMPLISHED. RMV'D T-CAP SECTION FROM RBL 68 TO LBL 7. FABRICATED A NEW T-CAP SECTION PER BGACO DWG 141N2937, FABRICATED REPAIR STRAPS AND INSTALLED PER REO G1 4007, REV B ON NON ROUTINE 24348. THE FLOORBEAM UPPER CHORD REPAIR AT BS 234, BETWEEN RBL 30 TO RBL 50 HAS RECEIVED FIRST 85625 STAGE APPROVAL FOR STATIC STRENGTH ONLY. A NEW FAA FORM 8100-9 MUST BE ISSUED BEFORE 07SEP2013 FOR THIS REPAIR TO REMAIN VALID. THE AIRCRAFT WILL BECOME UNAIRWORTHY IS A NEW 8100-9 IS NOT RECEIVED PRIOR TO 07SEP2013. DOCUMENTED ON NON ROUTINE 24348.