What was found
DURING HEAVY MAINTENANCE, N339JB (MSN 490) WAS REPORTED WITH A VISIBLE CRACK WAS DETECTED AFFECTING THE RIGHT HAND WING AFT REAR SPAR LOWER SKIN P/N 190-33065-032 AFT EDGE, BETWEEN RIB 10/RIB 11 (SEE REF /1/ EA). THE DAMAGE WAS OUT OF THE SRM’S SCOPE. FURTHER INSPECTIONS FOUND THREE ADDITIONAL CRACKED HOLES COMMON TO THE WING AFT REAR SPAR, AFFECTING THE LOWER SKIN ONLY. EMBRAER WAS CONTACTED AND INSTRUCTED TO TRIM OUT TWO CRACKED SKIN SECTIONS, OVERSIZING THE REMAINING TWO AFFECTED HOLES, PERFORMING NDT INSPECTIONS, FABRICATING AND INSTALLING TWO REPAIR BUSHINGS, FABRICATING AND INSTALLING ALUMINUM REPAIR FILLER, AND INSTALLING A DOUBLER PN 191-34897-001. THIS EC E19-744-01 WILL PROVIDE TEMPORARY REPAIR INSTRUCTIONS VALID FOR 12 MONTHS. EC E19-744-02 WILL TRACK THE 12-MONTH DTA; EMBRAER APPROVED THIS REPAIR PER REF /2/ ETD AND IS CLASSIFIED AS MAJOR.