What was found
DURING TAKEOFF ROLL, AT ABOUT 90 KNOTS, 5 PERCENT N1 LOSS FOR ABOUT 2 SECONDS. FOLLOWED BY 5 PERCENT N1 INCREASE, ALL OTHER PARAMETERS REMAINED NORMAL REMOVED AND REPLACED THE NR 1 ENGINE FUEL PUMP IAW EMM 73-00-00, SPECIAL PROCEEDURE 002. PERFORMED OPS AND LEAK CHECKS IAW MM 72-00-00, NO DEFECTS NOTED.