What was found
((CNQR)) THE PN 6750743-4 FRAME IS PART OF THE AILERON POWER CONTROL UNIT SUPPORT ASSY AND IS APPLICABLE TO ACFT. DURING SCHEDULED INSP, THE FRAME WAS FOUND TO BE BADLY FATIGUE CRACKED AND APPROACHING FAILURE. FAILURE OF THIS FRAME COULD CAUSE LOSS OF AILERON ROLL CONTROL AND/OR A LOCKED AILERON SYS. THE PART WAS REPLACED. AN AILERON FORCE FLIGHT CHECK WAS DONE IAW MM TASK 27-10-00-760 WITH SATISFACTORY RESULTS. NDT WAS ACCOMPLISHED ON ALL FASTENERS COMMON BETWEEN THIS FRAME PIECE AND ALL ADJOINING FRAME PARTS WITH SATISFACTORY RESULTS. MFG ENGINEERING IS INVOLVED WITH THE ISSUE AND THE INVESTIGATION AS TO CAUSE IS ON-GOING.