What was found
DURING REPAIR, FOUND PART CRACKED AT SEAL FLANGE. CRACK RESULTED IN .025 INCH DEFLECTION OF SEALING FLANGE AND CORRESPONDING LOSS OF TURBINE SECTION COOLING AIR AROUND ENTIRE DIAMETER OF SEAL CAUSING SECONDARY DAMAGE TO TURBINE SECTION COMPONENTS. THIS IS A CRITICAL SERVICE LIFE-LIMITED COMPONENT. LIMIT - 20,000 CYCLES. SUBMITTER SUGGESTS ALLIED SIGNAL ENGINEERING DETERMINE/CORRECT CAUSE OF CRACKING. NOTE: THIS IS THE 17TH ROTATING AIR SEAL FOUND CRACKED. TOTAL CYCLES, 7,920.