What was found
AT 70 KNOTS, LOUD BANG AND BRIGHT FLASH NOTED ON LEFT SIDE. ENGINE INSTRUMENTS NORMAL, ABORTED TAKEOFF, RETURNED TO RAMP FOR INSPECTION. ACCOMPLISHED RUN-UP OF NR 1, 2, 3, 4 ENGINES IAW M/M 72-0 P/W. ALL ENGINES CHECK OK ON GROUND, NO DISCREPANCIES AT THIS TIME.