What was found
EIGHT CRACKS FOUND IN LOWER SPLINES OF MAIN ROTOR SHAFT. MAIN GEARBOX PN 6435200400065, SN A6171 WAS REMOVED FOR OVERHAUL HAVING A TOTAL TIME OF 8857.7 AND 1430.6 HOURS TIME SINCE OVERHAUL. THIS INCLUDES COMPLETING A 130.6 HOUR EXTENSION. DURING THE INSPECTION PROCESS, EIGHT CRACKS WERE DETECTED BY FLUORESCENT MAGNETIC PARTICLE INSPECTION IN THE LOWER SPLINE AREA. CRACK LENGTHS ARE AS FOLLOWS: TWO AT .025, THREE AT .050, TWO AT .075 AND ONE AT .125. AS MANY AS THREE CRACKS WERE FOUND ON ONE SPLINE.