On 21 April 2017, a Boeing 777-300 which had just departed Amsterdam was advised by ATC of a suspected tail strike and by cabin crew of a scraping noise during takeoff. Fuel dumping was followed by a return to land and evidence of a minor tail strike was identified. The Investigation found that the tail strike had resulted from a gross error in data input to the takeoff performance calculation which resulted in inadequate thrust, slow acceleration and rotation at a speed so low that had an engine malfunction occurred, safe continuation or rejection of takeoff would have been problematic.