FHS, the new research helicopter: Ready for service

The DLR Flying Helicopter Simulator (FHS) has been taken into service by the end of 2002. A standard EC135 helicopter was significantly modified. In particular, the mechanical control system was replaced by a full authority fly-by-light control system. A specific system architecture was defined consisting of a multiple redundant core system, meeting the highest safety level, and a simplex experimental system giving the flexibility for easy adaptations. These characteristics together with an extensive instrumentation make the FHS a suitable tool for various applications. The helicopter was developed and financed in a co-operative effort by the DLR, Eurocopter Germany, Liebherr Aerospace, and the German Ministry of Defence. It was designed to support national and international research and technology programs. It is operated by the DLR in Braunschweig, where also the FHS related ground stations are located: a ground based system simulator and transportable telemetry and data evaluation stations. The paper first concentrates on the presentation of the FHS system philosophy and design. It explains the FHS operational modes and presents the ground facilities. Then, it gives an overview on the present user programs and finally presents an outlook on future extensions of the FHS.