An investigation into the crash of a U.S. Air Force F-15D in Britain last year found that the pilot had manoeuvred the jet too aggressively, coupled with the fact that the nose cone of the aircraft was imperfect, this caused the fighter into a spin which the pilot could not recover.
The board found that some sealant to patch a gap in the nose assembly had read the surface and affected the aerodynamic qualities of the jet.