What was found
SUPPLEMENTAL INFORMATION TO CHIR20171203 AND WILL REQUIRE FURTHER PROCESSING BY THE SDR/SIT QUALITY CONTROL GROUP REFERENCING A TELECON ON 3/12/2019. DISASSEMBLY OF COMBINING GEARBOX REVEALED THAT IN ADDITION TO BROKEN CONNECTOR, THE GEARBOX AND PINION GEAR SUPPORT HOUSINGS WERE CRACKED. THESE ITEMS WERE SENT TO THE MATERIALS ENGINEERING LABORATORY FOR EVALUATION. THIS LABORATORY REPORT,#18-034,IS ON FILE WITH CHIR823C. FRACTOGRAPHIC EVALUATION REVEALED THAT ALL CRACKS INITIATED AND PROPAGATED BY A FATIGUE MECHANISM.