What was found
WHILE PERFORMING A STRUCTURAL REPAIR IAW 57-90-10 FOR THE RT NACELLE UPPER NS 80.87 LEADING EDGE RIB. ON REMOVING THE CRACK FROM THE RIB ASSY IAW SRM. A CRACK WAS DISCOVERED IN BEHIND THE RIB ON THE KEELS ON WEB. AFTER REMOVAL OF THE RIB SECTION. CRACK BEGAN AT THE RADIUS CUT OUT JUST BELOW AND FORWARD OF THE SPAR STRAPS AT WS 136/137. THIS CRACK WAS VERIFIED THRU NDT PROCESS TO CONFIRM IS VALIDITY. THE BRACE SUPPORT AND THE DOUBLER INSIDE THE WHEEL WELL WERE REMOVED TO INVESTIGATE THE LENGTH OF THE CRACK. THE CRACK WAS FOUND TO BE A TOTAL LENGTH OF 1.5 INCHES LONG RADIATING FROM THE RADIUS, THROUGH A FASTENER HOLE, AND CONTINUING TO THE EDGE OF THE MLG DRAG BRACE FITTING AND DOUBLER.