What was found
DURING ROUTINE ENGINE SHOP VISIT, THE 2-5 SPOOL FROM ENGINE WAS FOUND WITH A STG 1 SEAL TEETH MISSING FRAGMENT. NO ABNORMAL ENGINE RUNNING CONDITION WERE REPORTED BY THE CUSTOMER BEFORE ENGINE INDUCTION IN OUR SHOP. THE ENGINE WAS REMOVED FOR SCHEDULED HIGH-TIME ENGINE REMOVAL FOR FULL PERFORMANCE RESTORATION SV. DECIDED TO LAUNCH AN HARDWARE INVESTIGATION TO IDENTIFY THE ROOT CAUSE OF SUCH MISSING FRAGMENT OCCURRENCE.