It was decided to pursue a full certification program, resulting in the production of two pre-production prototypes at the same time, it was chosen to give the Bo 108 a new designation of EC135 to correspond with the newly created Eurocopter company. Bo 108 prototype In the late 1990s, the design was revised with the introduction of the tail rotor system, an advanced rigid main rotor, composite materials, and resonance isolation systems. A second Bo 108 followed on 5 June 1991, this time with two TM319-1B Arrius engines unlike later production aircraft, both technology demonstrators flew with conventional tail rotors. The first prototype made its first flight on 17 October 1988, powered by two /1 engines. Technologies included on the Bo 108 included the first full-authority digital engine controls on a helicopter, a hingeless main rotor, and the adoption of a new transmission. ![]() MBB developed it in partnership with, the Bo 108 was initially intended to be a technology demonstrator, combining attributes of the successful with new advances and an aerodynamically streamlined design.
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