What was found
ETOPS SIGNIFICANT SYS - BTB- ABORTED TAKEOFF AT APPROX 75KTS DUE TO AUTO THROTTLE NOT ENGAGEING. ON TAXI BACK TO GATE, ENGAGED OK. PERFORMED MCDP TEST 2, 10,30 AND NO FAULTS NOTED. COMPLETED BRAKE CHECK, NR 1 AND 2 ENG TEST 3 AND PERFORMED THE ETOPS * ITEMS.