Future Ultra High by-pass Ratio engines are bringing new challenges in integration onto the airframe. These challenges are met by introducing short nacelles with slim aero lines. New solutions for the nacelle cowling system need to be developed, i.e. new compact actuation systems to open the cowls for maintenance are necessary. The proposed activity will consist in defining and testing a new cowl opening actuation system compliant with these new requirements, with a target for a TRL6 level, for potential exploitation on a future Long Range aircraft. Please refer to the full topic descriptions document published in this call.