USED TO PROVIDE A REFERENCE FLAW INDICATION FOR CALIBRATING EDDY CURRENT PROBE AND INSTRUMENTATION PRIOR TO CONDUCTING EDDY CURRENT INSPECTION OF THT 6TH-12TH STAGE COMPRESSOR AIR SEAL SHIELDING HOLES;CONSTRUCTED FROM REFERENCE AIR SEAL SEGMENT MOUNTED ON BOLOTRON;SECURED TO AN ECI BENCH (PWA54233 OR PWA38488);USED WHEN INSPECTING FOR FATIGUE CRACKS IN THE COOLING HOLES AT4000 CCY DEPOT INDUCTION INTERVAL