On 25 February 1977, MBB and Kawasaki signed a cooperative agreement to abandon their independent efforts to design twin-engined general purpose helicopters in favour of a collaborative venture to development of a new rotorcraft for that role.
MBB utilised their expertise with the rigid rotor system used on the earlier Bo 105 to develop the majority of the dynamic systems and flight controls, while Kawasaki focused on the airframe, structural elements, and various other components.
On 13 June 1979, MBB's flying prototype conducted its maiden flight at Ottobrunn, Bavaria
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