What was found
THE DEFECT WAS DISCOVERED DURING INSPECTION OF THE PART ON RECEIPT FROM A 3RD PARTY VENDOR. THE ALLISON GAS TURBINE 250-C20 SERIES OVERHAUL MANUAL PROVIDES IN TABLE VI-19 INSPECTION CRITERIA FOR POWER TURBINE COUPLINGS. ITEM 58 OF THIS TABLE, ON PAGE 6-119 ALLOWS NO DAMAGE SUCH AS 'NICK, CHIPS, GROOVES' IN THE SPLINE TEETH. THE DAMAGED TOOTH CLEARLY RENDERS THIS SHAFT UNSERVICEABLE.