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Report: SIA tailstrike caused by miscalculated rotation speed
17 December 2003

Acording to N.Z. investigators, the March 2003 Singapore Airlines Boeing 747 tailstrike at Auckland occurred because the rotation speed was 33 knots less than the 163 knots required. The rotation speed had been mistakenly calculated for an aeroplane weighing 100 tonnes less than the actual weight. The system defences did not ensure the errors were detected, and the aeroplane flight management system itself did not provide a final defence against mismatched information being programmed into it. (TAIC)