What was found
DURING MAINTENANCE TO REPAIR FUEL LEAKS, FIVE STRUCTURAL BOLTS THAT ATTACH THE UPPER WING SKIN TO BEAMS NR 1 AND NR 3 WERE FOUND SHEARED. TWO RT WING BEAM NR 1 BOLTS ALSO SHEARED. THIRTY-TWO WING PLANK TO LT AND RT WING BEAM BOLTS WERE REPLACED A PRECAUTIONARY MEASURE. MANUFACTURERS'''' TESTING OF THE FAILED BOLTS REVEALED THEM TO BE DEFECTIVE. SUBMITTER STATED FOUR MONTHS HAVE ELAPSED SINCE DISCOVERY OF THE BOLT FAILURE AND NO SERVICE BULLETIN HAS BEEN ISSUED CONCERNING THIS PROBLEM. (X)