GfL delivers aeronautical study concerning flight operations at special-purpose airfield Iserlohn-Sümmern due to the installation of wind turbines in its vicinity
February 2018 | Safety Assessment
The company Energie- und Messtechnik/Windenergie GELSENWASSER AG plans to install three wind turbine generator systems (WTGS) west of special-purpose airfield (SPA) Iserlohn-Sümmern. It was noted that the obstacle limitation surfaces according to the national directive NfL I 92/13 are penetrated and the WTGS additionally affect the airspace used for approach and departure by small powered aircraft as well as glider tugs. In order to proof safe flight operations GfL conducted an aeronautical study (AS). Therefore, specific safety areas surrounding the WTGS were determined taking into account obstacle requirements and turbulences caused by the WTGS’ rotors. The resulting risks were analyzed by applying a four-step evaluation scheme in order to clarify the feasibility of critical flight trajectories leading to potential collisions. These steps contain the analyses of minimum requirements according to EASA CS-23 for powered aircraft and national directive NfL II 17/03 for sailplane towing with microlights, flight performance data pursuant to certified aircraft flight manual of the reference airplane operating at the SPA and finally GPS flight tracks provided by the SPA’s users. Because of detected violations within these steps, several risk mitigation measures were derived (especially implementation of a circuit / traffic pattern) within the risk assessment in order to guarantee safe flight operations at SPA Iserlohn-Sümmern.
