The 1952 Farnborough Airshow DH.110 crash was an air show accident involving a de Havilland DH.110 which killed 29 spectators as well as pilot John Derry and onboard flight test observer Anthony Richards. The DH.110, a prototype, was being demonstrated at the Farnborough Airshow when during a manoeuvre, the aircraft broke up. The cause was a faulty wing leading edge design. The DH.110 was grounded and strict safety procedures were subsequently enacted. After modifications to the design the DH.110 entered service with the Royal Navy as the de Havilland Sea Vixen.