What was found
WILLIAMS INTERNATIONAL ENGINE MODEL FJ44-1AP, ENGINE SERIAL NUMBER 290520, FROM AIRCRAFT 525M2-1057 (SE-RVZ), WAS RETURNED TO OUR REPAIR STATION FOR UNSCHEDULED REPAIR. THE ENGINE OEM PROVIDED A REPORT FROM THE AIRCRAFT OPERATOR THAT DURING CRUISE ABOVE 94% N1, THERE WAS A CHANGE IN ENGINE SOUND CHARACTERISTICS. A SUBSEQUENT BORESCOPE INSPECTION BY THE SERVICE CENTER IDENTIFIED ONE MISSING BLADE ON THE INTERMEDIATE PRESSURE COMPRESSOR (IPC) ROTOR. AFTER THE ENGINE WAS SHIPPED TO OUR REPAIR STATION AND DISASSEMBLED, THE LIBERATED IPC ROTOR BLADE WAS CONFIRMED. THERE WAS ALSO DAMAGE TO THE FAN STATOR, IPC STATOR, BYPASS DUCT, AND MIXER. OIL WAS FOUND IN THE BYPASS DUCT, LIKELY COMING FROM A CRACK FOUND IN THE INTERSTAGE’S BEARING CAVITY.