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AAIB: prelim report on control problems during maintenance check flight
4 March 2009

The U.K. AAIB issued a preliminary report regarding their investigation into a serious incident in January 2009.
A Boeing 737-73V, G-EZJK, experienced a violent pitch down during a combined maintenance check and customer demonstration flight. Vmo was exceeded by 100 knots, and a 10,000 foot loss of altitude occurred. The aircraft recovered from the maneuver and landed safely. Four flight crewmembers were on board, and there were no passengers. None of the flight crewmembers were injured. (AAIB)