Lauda Air Flight 004
The positions of the left engine thrust reverser actuators along with data from the electronic engine control (EEC) and the cockpit voice recorder (CVR) indicate that the left engine thrust reverse system deployed while the airplane was at approximately .78 Mach (478 kn, 550 mph, 885 km/h), climbing through 24,700 feet to flight level 310. The preliminary evidence suggests that the reverse event was recognized by the flight crew, but that the airplane departed controlled flight.