What was found
LEFT TORQUE PEDAL BRACKET FAILED PRIOR TO ENG START ON GROUND. FAILED BRACKET WAS SENT TO LOCAL LAB FOR FRACTOGRAPHIC EXAMINATION. -7 (RT) BRACKET FROM SAME HELICOPTER AND BOTH -8 AND -7 BRACKETS FROM SECOND HELICOPTER WERE REMOVED FOR VISUAL AND NDT INSP. EVIDENCE OF FATIGUE CRACK IN A RADIUS AT UPR LT (PILOTS LT SIDE) MTG FLANGE. FATIGUE CRACKS INCREASE TO A LENGTH OF APPROX. .1250 TO .1875 INCH PRIOR TO FINAL OVERLOAD, SUGGEST A HIGH CYCLIC STRESS MAGNITUDE AND A LOW NUMBER OF STRESS CYCLES TO FAILURE. 3 OF THE 4 MTG FLANGES HAD BORKEN OFF. CRACK THROUGH UPPER LT MOUNTING FLANGE EXHIBITED. FRACTURE OCCURRED AT AN INSIDE CORNER. THE TOTAL TIME OF THE SECOND HELICOPTER WAS 13,854.