What was found
WHILE A/C WAS IN FOR HEAVY MAINTENANCE VISIT, MAINTENANCE FOUND LT RIB 52 ATTACH ANGLE CRACKED JUST INBOARD OF AILERON TORQUE TUBE SUPPORT FITTING. REMOVED, FABRICATED, LOCATED, DRILLED, AND INSTALLED NEW ANGLE AT FRAME 52 LT RIB IAW ARM 51-40-02, 51-40-03, AND 51-43-03.