On 6 August 2009, a Gripen from F 17 Kallinge belly-landed and skidded off the runway, after the pilot forgot to extend the landing gear before landing. A minor fire broke out, but it was soon put out by the airbase fire brigade. The pilot escaped unharmed and could walk away from the aircraft. According to the SHK report, a contributory cause was high mental workload because the pilot had recently transitioned to flying JAS 39C, which uses international units (feet, knots) instead of metric units (meters, km/h). The ground proximity warning system activated 8 seconds before touchdown, but the pilot disregarded it because it was known to sometimes give false alarms.