The aircraft was making touch and go landings and had landed for final touchdown. When the reversers were applied the left engine accelerated but did not go into reverse while the right engine responded normally. It became impossible to control the aircraft longitudinally. To avoid veering off the runway, the aircraft was lifted off but fell violently to the ground. It bounced and deviated 1000 m from the centreline, then veered to the right, struck two cement posts and collided with a wire fence. Contributing factors: insufficient experience on the aircraft by the co-pilot in the pilot’s seat and the pilot in the co-pilot’s seat. inadequate flight preparation in terms of training. a non-stabilized app and perhaps excess speed. possible asymmetric actuation of the reversers without repetition in subsequent checks. the use of a flight manual which was not suited to the aircraft equipment.