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First Flown on 9 November 1939 with Dipl. Ing. Leutnant Carl Francke, then chief of the Erprobungsstelle Rechlin central flight test center, at the controls. The flight terminated abruptly after only 12 minutes due to overheating engines. Francke was pleased with the general handling and landing characteristics of the prototype but complained of some vibration in the airscrew shafts, the inadequacy of the tail surfaces under certain conditions, and some flutter which accompanied any vigorous movement of the elevators.