After the accident, the AAIB and the helicopter's manufacturer, Stratford, Connecticut-based Sikorsky Aircraft, reached the opinion that the electrical energy imparted by the lightning strike in 1999 exploited an anomaly that was built into the blade at manufacture and damaged the spar.
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The wreckage, which included the helicopter's flight data recorder, was brought ashore at Great Yarmouth on 21 July, and transferred to an Air Accidents Investigation Branch facility near Aldershot, Hampshire, where it was examined by investigators from the AAIB, the US National Transportation Safety Board and Federal Aviation Administration, the aircraft manufacturer, and the operator.
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