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BOEING 737-33A, G-ZAPZ, 14 APRIL 2012 CONTENTS * Boeing 737-33A, G-ZAPZ * Summary * Download report BOEING 737-33A, G-ZAPZ SUMMARY: An onboard hand-held Electronic Flight Bag (EFB) computer
was used to calculate the aircraft’s takeoff performance. The commander omitted to enter the aircraft’s takeoff weight into the performance calculation software, which defaulted to the
previous flight’s takeoff weight. The crew did not cross-check the data and incorrect speeds and thrust were calculated and subsequently used for the takeoff. As a consequence, the airspeed
at rotation was too low and the pitch angle was sufficient to strike the tail on the runway. A broken spring within the aircraft’s elevator feel and centering unit caused reduced resistance
in the flight controls in pitch, contributing to the excessive pitch attitude achieved during rotation. The investigation also revealed wider issues relating to the general design and use of
EFB computers to calculate performance data. Two Safety Recommendations are made. DOWNLOAD REPORT: Boeing 737-33A G-ZAPZ 04-13.pdf (1,608.13 kb) UPDATES TO THIS PAGE Published 10 December
2014 Contents