What was found
AT LETTER CHECK IN TPA, THE UPPER CHORD AT RBL 20 RUNNING FORE/AFT IN THE AFT VENTRAL STAIRWAY TORQUE BOX WAS FOUND CRACKED AT STA 1273. THE INBOARD END OF THE FLOOR SUPPORT ANGLE AT STA 1273 HAD AN APPROX. 3 INCH CRACK AND THE FRAME BEAM HAD A 4 INCH LONG CRACK IN THE INBOARD END. THE AFT SUPPORT ANGLE WILL BE REPLACED TO FACILITATE INSTALLATION. THIS REPAIR WILL BE ACCOMPLISHED IN ACCORDANCE WITH S/B 727-53-0129, REV. 4.