On 15 July 2018, an Airbus 220-300 crew were slow to recognise that the maximum de-rate thrust required for their takeoff from Porto had not been reached but after increasing it were able to get safely airborne prior to the end of the runway. The Investigation found that applicable SOPs had not been followed and that the function of both the spoiler and autothrottle systems was inadequately documented and understood and in the case of the former an arguably flawed design had been certified. Five similar events had been recorded by the aircraft operator involved in less than six months.