On 31 May 2010, a Gripen from Norrbotten Air Force Wing (F 21) came loose and speed away during a static engine test. The aircraft gained considerable speed before rolling off the hard surface and onto nearby soft terrain, where it then flipped over. The technician in the aircraft, lieutenant Sandra Halvarsson, escaped with minor injuries. There is unconfirmed information that the engine was accidentally started with full throttle. As the accident did not involve a plane flying or preparing to fly, it is not considered to be a crash.