What was found
DURING A ROUTINE INSPECTION, THE TRAILING EDGE WING SKIN ON THE RIGHT WING WAS FOUND CRACKED IN SEVERAL PLACES. CRACKS WERE AT THE RIVET HOLES ALONG THE REAR MOST OF THE SKIN. SUBMITTER STATED THAT IMPROPER DEBURRING OF THE HOLES AND IMPROPER RIVET SPACING FOR THE RIVETS AND ALLOWED THE SKIN TO FLEX AND VIBRATE IN-FLIGHT. RIVETS ARE .1250 INCH AND SPACED 2.1250 INCHES APART, COUNTERSUNK INTO .016 INCH METAL THAT IS NOT DIMPLED FOR SUCH A LARGE RIVET.