This is a Notable Operational milestone.
This was the #1 prototype equipped with Turbomeca Arrius 2B engines. This was the first helicopter in the Eurocopter range. The flight was carried out by Eurocopter Test Pilot Helmut Ruckert and Flight Test Engineer Manfred Hausner. The aircraft was developed from the MBB Bo.108.
Source: "EC.135 maiden flight is Completed", FLIGHT International, 23 February - 1 March 1994, Page 30