The SAAB JAS 39 Gripen is a multi-role combat aircraft produced in Linköping, Sweden. RUAG Aerostructures produces highly stressed structures for the Gripen, such as the pylons (payload mountings). Payload mountings are devices that carry additional fuel tanks, reconnaissance systems or guided missiles. They are complex technological components which contain both electronic and mechanical systems. They must meet the highest standards in terms of aerodynamics and resilience. Up to eight mountings can be attached to each Gripen.