The preliminary investigation into the crash of Voepass Linhas Aéreas flight PTB2283, an ATR 72-500, is looking at icing as one of the possible factors in this tragic accident. A SIGMET warned of severe icing in the area where the accident took place: SBCW SIGMET 9 VALID 091530/091930 SBCW – SBCW CURITIBA FIR SEV ICE FCST WI S2024 W05806 – S2204 W05801 – S2221 W05549 – S2359 W05525 – S2349 W05440 – S2418
SKYbrary has a comprehensive article that provides guidance for controllers on what to expect from an aircraft experiencing the effects of in-flight icing. It includes some considerations that help controllers provide as much support as possible to the aircraft concerned while maintaining the safety of other aircraft in the vicinity and of service provision in general.