On 2 April 2011, the crew of a Gulfstream G650 undertaking a pre-type certification experimental test flight take off with one engine intentionally inoperative were unable to recover controlled flight after a wing drop occurred during take off. The aeroplane impacted the ground without becoming properly airborne and was destroyed by a combination of the impact and a post crash fire with fatal injuries to all four occupants. The subsequent Investigation found that preparation for the flight had been inadequate and had failed to incorporate effective response to previous similar incidents where recovery had been successful.