What was found
DURING HEAVY MAINTENANCE, ONE CRACK WAS FOUND ON THE LH WING MAIN BOX LOWER SKIN P/N190-33065-005 AFT EDGE BETWEEN RIBS 10-11. SEE REF.(1) FOR DETAILS. AEROMAN CONTACTED EMBRAER FOR REPAIR DISPOSITION, AND EMBRAER PROVIDED THE REF.(2) ETD, INSTRUCTING TO CUT OUT THE DAMAGE, ACCOMPLISHING NDT INSPECTIONS, AND INSTALLING A REPAIR DOUBLER. REPAIR WAS CLASSIFIED AS A MAJOR PERMANENT.