What was found
DURING INSPECTION/REPAIR FOR LOW POWER, FOUND SEAL PLATE CRACKED. SB 72-0840 AUTHORIZES INSTALLATION OF THIS PART TO INCREASE SEAL PLATE TENSION AGAINST FIRST STAGE ROTOR ASSY. INCREASED TENSION ON THE SEAL FLANGE RESULTS IN CRACKING AT THE EDGE PROPAGATING RADIALLY INWARD. SUBMITTER SUGGESTS ALLIED SIGNAL ENGINEERING REVIEW CAUSE/EFFECT. NOTE: THIS IS A CRITICAL LIFE-LIMITED COMPONENT. LIMIT IS 20,000 CYCLES. THIS IS THE 9TH SEAL PLATE FOUND CRACKED. TOTAL CYCLES, 7,427.