Safety investigators said pilot input error was the cause of an incident in which the tail of a Qantas jet carrying 152 people hit the tarmac on take-off.
Australian Transport Safety Bureau officials found two Qantas pilots input wrong data into cockpit iPads prior to take-off.
The information wrongly calculated the plane was 10 tonnes lighter than it actually was, according to a ATSB report.
"The tail strike was the result of two independent and inadvertent data entry errors in calculating the take-off performance data," the 14-page ATSB report said of the incident which happened in August 2014.
"As a result, the take-off weight used was 10 tonnes lower than the actual weight. This resulted in the take-off speeds and engine thrust setting calculated and used for the take-off being too low. As a result, when the aircraft was rotated, it overpitched and contacted the runway."
