What was found
LEFT AND RIGHT WING FUEL PANELS 610AB, 650AB, 640AB, 640CB, 640DB, 640FB, 540CB, 510AB, 540AB, 540DB, 540FB, 550AB HAVE CORROSION. FOUND DURING C-CHECK INSPECTION. DAMAGE REPAIRED IAW CRJ REO 601R-57-21-079 REV NC. PANEL 640FB CORROSION BEYOND LIMITS, 650AB CORROSION BEYOND LIMITS, 510AB MAT'L LOSS NEGLIGABLE, 540CB MAT'L LOSS .004, 540AB MAX MAT'L LOSS .008, 640 DB MAX MAT'L LOSS .018, 550AB MAX MAT'L LOSS .016, 640CB MAX MAT'L LOSS .014, 610AB MAX MAT'L LOSS .006, 640AB MAX MAT' L LOSS .007, 540FB MAX MAT'L LOSS .013. NEW FUEL LIDS FOR 640FB AND 650AB INSTALLED P/N OFF: 601R10.