What was found
DURING POSTTEST BORESCOPE INSPECTION DAMAGE WAS IDENTIFIED ON THE HPC STAGE 6 BLADES. THIS DAMAGE WAS NOT EVIDENT AT INCOMING INSPECTION. INVESTIGATION WITH THE OEM ENGINEER ON SITE, IDENTIFIED THAT A SINGLE HPC STAGE 6 VANE SEGMENT HONEYCOMB SEGMENT HAD SEPARATED FROM THE VANE ASSEMBLY CAUSING THE DAMAGE. THE ENG HAS PASSED TEST WITH NO UNUSUAL PERFORMANCE INDICATIONS. THE INVESTIGATION IDENTIFIED NO UNUSUAL CONDITION DURING STRIP, E.G. LOOSE OR MISSING PARTS. THE OEM ENGINEER DID NOT IDENTIFY ANY CONTRIBUTING WORKSHOP ISSUES, E.G. FOD, DOD. THE OEM HAS TAKEN THE DAMAGED PARTS FOR FURTHER INVESTIGATION. THE HPC MODULE WILL BE SUBJECT TO LEVEL 4 OVERHAUL STRIP, INSPECTION & RE-ASSEMBLY TO RETURN TO SERVICEABLE CONDITION.