What was found
DURING INSPECTION FOR LOW POWER, FOUND PART CRACKED 12 PLACES UP TO APPROXIMATELY .5 INCH. SB 72-0840 AUTHORIZES INSTALLATION OF THIS PART TO PROVIDE INCREASED SEAL PLATE TENSION AGAINST FIRST STAGE ROTOR. THIS INCREASED TENSION RESULTS IN CRACKING AT THE SEAL PLATE EDGE DIAMETER. CRACKING RESULTS IN AIR LEAK AND SUBSEQUENT POWER LOSS. SUGGEST ALLIED SIGNAL ENGINEERING REVIEW PART/INSTALLATION PROBLEM.