On 9 October 2018, an ATR 72-200 left the runway during a night landing at Trollhättan before regaining it undamaged and taxiing in normally. The excursion was not reported or observed except by the flight crew. The subsequent discovery of tyre mark evidence led to an Investigation which concluded that the cause of the excursion had been failure of the left seat pilot to adequately deflect the ailerons into wind on routinely taking over control from the other pilot after landing because there was no steering tiller on the right. The non-reporting was considered indicative of the operator's dysfunctional SMS.