The SibNIA TVS-2MS, TVS-2DT, TR-301 and TVS-2DTS are a series of single-engined, biplane utility aircraft developed by the Siberian Aeronautics Research Institute as a light multi-role successor to the An-2. The TVS-2 eventually was reconsidered as an entirely new airplane, and the position of the An-2's new replacement was re-opened. The abbreviation TVS stands for Turbovintowoy, or "Turboprop Airplane" (самолёт).