What was found
WHILE PERFORMING OFF AC INSPECTION OF MAIN ROTOR BLADE, UTILIZING EDDY CURRENT, DISCOVERED ONE CRACK EMANATING FROM FIRST LIGHTING HOLE AT APPROX STA 36.5 IN (C) CHANNEL. SECTION BLADE TO VERIFY EDDY CURRENT FINDINGS. CRACK EXTENDS FROM ID OF LIGHTING HOLE UP TO START OF BEND RADIUS. AC PARKED STATIC WITHOUT OR IMPROPER BLADE TIE DOWNS DURING GUSTING WINDS OR AROUND OTHER OPERATING AC. EXCESSIVE TENSION ON BLADE TIE DOWNS. MANUFACTURE DEFECT OR PRACTICES. (K)