What was found
PILOTS REPORTED THAT IN CRUISE FLIGHT LEFT LOW FUEL PRESSURE ANNUNCIATOR ILLUMINATED AND LEFT FUEL PUMP CIRCUIT BREAKER POPPED A FEW SECONDS LATER. AFTER LANDING, MAINTENANCE CREW REENGAGED CIRCUIT BREAKER, AND PUMP RAN, BUT WAS EXTREMELY NOISY. THERE WERE NO PREVIOUS INDICATIONS SUGGESTING IMMINENT PUMP FAILURE. MANDATORY OVERHAUL FREQUENCY OF PUMP IS 2000 HOURS, THIS PUMP HAD 1,407 HOURS TOTAL TIME AND SINCE INSTALLATION APRIL 99. SPECULATE THAT AN INTERNAL BEARING FAILED BASED ON THE NOISE PUMP MADE AND THE FACT THAT THERE WAS NO METAL PARTICLE CONTAMINATION IN THE OUTPUT LINE OR IN LINE FILTER. PUMP SENT TO OVERHAUL FACILITY TO DETERMINE ACTUAL FAILURE.