What was found
(CAN) ON A 'CAT A' TAKE-OFF (DURING THE REVERSING PHASE) THE PILOT REPORTED TORQUE FLUCTUATIONS ON THE NR 1 ENGINE. ALL ENGINE PARAMETER THEN WENT TO ZERO (ENGINE OUT). THE PILOT LOST CONTROL OF THE A/C, ITTURNED LT AND THE TAIL HIT AN OBSTACLE. THE PILOT COMPENSATED BY TURING RIGHT AND THE TAIL HIT THE SAME OBSTACLE AGAIN AFTER WHICH THE A/C FLIPPED ON ITS SIDE.IT WAS ALSO REPORTED THAT THE PILOT HA D DIFFICULTIES STARTING THE NO. 1 ENGINE BEFORE THE FLIGHT. P&WC WILL INVESTIGATE THE INCIDENT AND UPDATE THIS SDR ONCE ROOT CAUSE HAS BEEN ESTABLISHED.