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Icing a factor in two similar Airbus 321 incidents near Toronto, Canada
11 August 2005

TSB Canada released its final report into two similar Airbus A.321 incidents that occurred at Toronto International Airport on December 7, 2002. The investigation revealed that, both aircraft suffered pilot-induced oscillations in icing conditions during the approach. The Airbus A/321 normal, lateral flight control laws programmed into the elevator aileron computer provided higher roll efficiency in these wing icing conditions, which resulted in a reduced stability, causing the aircraft to roll slightly from side to side. In both occurrences, the pilots applied right and left control inputs to try to stop the rolling movement, but the magnitude of the oscillations increased. Both aircraft landed safely. (TSB)