Investigation
The investigation was carried out by Brazil's Aeronautical Accidents Investigation and Prevention Center (Centro de Investigação e Prevenção de Acidentes Aeronáuticos, CENIPA). Data from the flight data recorder and cockpit voice recorder (CVR) were downloaded by the National Transportation Safety Board in the United States commencing July 20 and July 23 respectively. Based on preliminary data from the FDR, on July 25 Airbus cautioned A320 operators to ensure that both thrust levers are set to idle during flare. The transcript of the CVR was released on August 1. It shows that the pilots were aware of the wet runway conditions and the deactivated thrust reverser. The pilots' comments suggest that the spoilers did not deploy and that they were unable to slow the aircraft. Crew error has not been ruled out.
An investigation by the Brazilian Public Safety Ministry released in November 2008 concluded that the pilots mistakenly retarded only the left engine to idle, because the right one had no thrust reverser working when in fact it was necessary to retard both engines in order for the spoilers to work. They also said that the National Civil Aviation Agency should have closed the airport on the night the plane landed because of heavy rains; that Congonhas airport authorities shared the blame because its runway had not been properly constructed with grooves to drain away excess rainwater, contributing to the crash; that the plane's manufacturer, Airbus, should have provided alarms warning the pilots that the braking system was failing; and that TAM failed to properly train its pilots, who did not act correctly in the emergency.
Read more about this topic: TAM Airlines Flight 3054