As the aircraft lifted off the runway on the accident flight with both engines at full power, a faulty switch in conjunction with a possible short circuit caused the right engine's thrust reverser to deploy. The imbalance of power resulted in the aircraft rolling and veering to the right as it was climbing away from the runway. The safety system automatically cut the power to the engine suffering the thrust reverser malfunction. There was no alarm or other indication in the cockpit to indicate that a thrust reverser had been accidentally deployed. The crew had no way of knowing what the true problem was. The copilot, seeing the right engine power lever automatically move to the closed position, thought that the lever had slipped back due to a problem with the autothrottle system and pushed it back to the full power position alongside the left engine throttle lever. Once again, the automatic safety system closed the right engine throttle and the captain, who was conducting the takeoff, called for the autothrottle system to be switched off. After switching off the system, the copilot again pushed the right engine power lever fully forward and forcefully held it there.