 On 6 May 1988 , Chinook HC Mk1 <unk> hit a pier at Hannover Airport while taxiing into position in a confined space . Its front rotor struck the underside of Pier 10 , causing the helicopter to rear up vertically and then fall on its side . A fire started at the rear of the fuselage and soon spread . Three crew members were killed and one had major injuries ; the Chinook was destroyed . 
