What was found
DURING THE INSTALLATION OF THE APB BLENDED WINGLET, THERE WAS AN INSTALLATION ERROR WHILE TRIMMING THE SHEAR TIE AT THE RT WING BETWEEN S-11 AND S-12 ON RIB 18 AT WING STATION 565.50. THE HORIZONTAL LEG OF THE 112N5176-6 CHORD UPPER SHEAR TIE SURFACE WAS BLENDED RESULTING IN AN AREA OF REDUCED MATERIAL THICKNESS NEAR THE RADIUS OF THE CHORD. APB WAS CONTACTED AND PROVIDED AN APPROVED REPAIR CONSISTING OF TRIMMING OUT A PORTION OF THE CHORD, AND LETTING SOME OF THE BLENDS REMAIN. PLEASE REFER TO 462999-14.