What was found
NR 1 ENGINE STALLED IN STEADY STATE CRUISE. ENGINE REPLACED AT SFO. SHOP TEARDOWN REVEALED FOD DAMAGE IN THE FORWARD STAGES OF THE HP COMPRESSOR. ONE 8TH STAGE COMPRESSOR BLADE HAD FRACTURED IN THE AIRFOIL 1/2" ABOVE THE PLATFORM. THERE WAS A SHARP NICK AT THE AIRFOIL LEADING EDGE, AND EVIDENCE THAT A CRACK INITIATED AT THIS SITE, AND PROGRESSED IN FATIGUE UNTIL THE BLADE FRACTURED. THE HP COMPRESSOR MODULE, S/N B22141, WAS "FIRST RUN" AND HAD NEVER BEEN DISASSEMBLED SINCE MANUFACTURE. PROPER VANE RIGGING, AND VSV HARDWARE INTEGRITY, WERE CONFIRMED PRIOR TO START OF TEARDOWN. THE SOURCE OF THE FOD WAS NOT DISCOVERED.