engine remained at CL because the Airbus autothrottle system, unlike other aircraft manufacturers, does not automatically move the levers when the autothrust controller changes engine settings. Therefore, the pilots may have thought that the right engine was at idle power without realizing that Airbus autothrust logic dictates that, when one or more of the thrust levers is pulled to the idle position, the autothrust is automatically disengaged. Thus, when the pilot pulled the left engine thrust lever to idle, it disconnected the autothrust system and the computer did not retard the right engine power to idle. The A320's spoilers did not deploy during the landing run, as the right thrust lever was above the "idle" setting required for automatic spoiler deployment. Since the right engine thrust lever was still in the "climb" detent at that time, the right engine accelerated to climb power while the left engine deployed its thrust reverser. The resulting asymmetric thrust condition resulted in a loss of control and a crash ensued. Timeline Source: Congonhas Aviation safety in Brazil had been under increased scrutiny following the mid-air collision in September 2006 over the Amazon of Gol Transportes Aéreos Flight 1907 and an Embraer Legacy 600 (see Brazil's 2006-2007 aviation crisis). Congonhas was singled out for having safety issues relating to operations in wet weather due to its location and runway characteristics for the traffic it serves. The 35L runway at Congonhas is long. Congonhas's counterpart in Rio de Janeiro, the Santos Dumont Airport, has an even shorter runway, at . Both airports receive the same type of traffic — ranging from small private planes to Boeing 737s and A320s. Many variables affect the landing distance of an aircraft, such as approach speed, weight and the presence of either a tailwind or a headwind. For an Airbus A320, a landing speed of higher than normal can result in as much as a 25% increase in the runway length needed to stop an aircraft. Wet weather can also significantly reduce the braking performance of aircraft, leading to an increase in the minimum runway length requirement. Pilots have called Congonhas airport the "aircraft carrier," because of the runway's short length and because pilots are told to go-around if they overshoot the first of runway. In June 2007, a Brazilian judge briefly banned flights using Fokker 100, Boeing 737-700 and Boeing 737-800 aircraft in and out of the airport. The