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.
Description
On 15 July 2018, an Airbus 220-300 (HB-JCC) being operated by Swiss International Airlines on a scheduled international passenger flight from Porto to Geneva as LX 2077 failed to get airborne in normal visibility at night until much nearer the end of the runway than should have been the case, after it was realised that the thrust initially set for takeoff was insufficient and it had been increased accordingly. The remainder of the flight was without further event.
Investigation
No notification of the event was made to either to the Portuguese Air and Rail Accident Investigation Agency (GPIAAF) or the Swiss Transportation Safety Investigation Board (STSB) until the latter was advised of it 9 days later. After passing this information to the GPIAAF, they delegated investigation to the STSB who then carried out a comprehensive investigation. Relevant data on the CVR had long since been overwritten but DFDR data was downloaded and recorded ATC data from Porto was also retrieved.
It was noted that the Captain (born 1959 and a Swiss national) who had been PF for the investigated flight, had a total of 14,766 flying hours of which 301 hours were on type and that the First Officer (born 1984 and also a Swiss national) had a total of 1,783 flying hours of which 397 hours were on type. It was additionally noted that the flight from Porto to Geneva was the crew’s second sector since beginning their current flight duty period after being free of duty for in excess of 20 hours at Geneva.
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