What was found
LEFT WING LOWER PLANK FUEL TANK ACCESS DOOR CUTOUT AT WS 54.897 (540BB, HOLE NR 1) HAS FRETTING DAMAGE AT INBOARD AND OUTBOARD ENDS. INBOARD END MEASURES APPROX 9.5 INCH BY .30 INCH BY .004 INCH DEEP. OUTBOARD END MEASURES APPROX 4.5 INCH BY .30 INCH BY .004 INCH DEEP IN NON-CRITICAL AREA. MAINTENANCE REPAIRED FRETTING DAMAGE IAW REO 601R-57-21-030 REV F. (M)