Voepass Linhas A‚reas flight PTB2283, an ATR 72-500, was destroyed when it crashed near Vinhedo, S?o Paulo. All 58 passengers and 4 crew members perished in the accident. The flight had departed Cascavel Airport, PR (CAC) at 14:58 UTC, bound for S?o Paulo-Guarulhos International Airport, (GRU). For almost the entire route, a SIGMET was active with severe icing between FL120 and FL210. During the climb to cruising altitude, the flight crew turned on Propeller anti-icing 1 and 2. From 15:14 the Electronic Ice Detector connected to the Centralized Crew Alert System (CCAS) emitted an alert signal upon passing FL130. At 15:15, immediately after turning on Airframe de-icing, a fault occurred and Airframe de-icing was turned off again. From then on intermittent Electronic Ice Detector alert signal were emitted by the CCAS. At 16:17 Airframe de-icing was turned on again. About a minute later, at a speed of 191 kts, the CRUISE SPEED LOW alert was triggered. The captain then started the briefing for the approach for landing in GRU. At 16:19:07 – the Airframe de-icing was turned off. After contacting S?o Paulo Approach Control, the flight was instructed to maintain FL170 due to traffic. At 16:19:28, at a speed of 184 kts, the DEGRADED PERFORMANCE alert was triggered, together with a single chime. This coincided with the exchange of messages between the controller and the crew. At 16:20:00 – the first officer commented, ?a lot of icing? and the Airframe de-icing was turned on for the third time. At 16:20:33 the Approach controller cleared the aircraft to fly direct to SANPA position, maintaining FL170, and informed that the descent would be authorized in two minutes. This was acknowledged by the crew. While in a right turn to SANPA position, at a speed of 169 kts, the INCREASE SPEED alert was triggered, in conjunction with a single chime. Immediately afterwards, vibration noise was heard in the aircraft, simultaneously with the activation of the stall alert. At 16:21:09 control of the aircraft was lost, and it entered an a spin until colliding with the ground. The aircraft rolled to the left to a bank-angle of 52 degrees, and then rolled to the right to a bank-angle of 94 degrees, performing a 180-degree turn in a clockwise direction. Subsequently, the turn was reversed to an anticlockwise direction, with the aircraft completing five full rotations in a flat spin before crashing into the ground.