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Mr Williamson, 30, from Londonderry in Northern Ireland, was working at Bournemouth Airport at the time of the accident.
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It took De Havilland Aviation (DHA), based at Bournemouth Airport, three years to restore the craft and gain a full permit to fly.
BBC: Vintage Red Arrow to star at show
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The third such incident was on 22 June near Bournemouth airport when an ATR 72 passenger aircraft and another Piper came within 400 yards horizontally of each other.
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The road serves Bournemouth Airport, Christchurch, Poole and Bournemouth.
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The Red Arrows lost two pilots in 2011 with Flt Lt Cunningham dying in November and pilot Flt Lt Jon Egging, 33, from Rutland, dying when his Hawk aircraft came down after performing at an air show near Bournemouth airport in Dorset in August.
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