As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE NR 1 FLAME OUT DURING TAKEOFF AT 80 KNOTS, ALL PARAMETERS WERE NORMAL UNTIL FLAME OUT OCCURED. CREW ADVICED TOWER CLEARED RUNWAY AND RETURNED BACK TO BLOCKS. REMOVED AND REPLACED NR 1 ENGINE FUEL PUMP AND DISCOVERED THE SHAFT SHEARED OFF. PERFORMED LEAK AND OP'S CHECK IAW PRATT AND WHITNEY 73-11-01, 73-21-01 AND B727 AMM 71-00-00.