The M250 turboshaft engines are of two-shaft modular design featuring a two-stage LP turbine, two-stage HP turbine, and a gearbox with 6,000rpm output. Compressed air is routed to the aft end of the engine for combustion, with exhaust gases exiting from the middle of the engine.
The Series II features four to six-stage axial and single-stage centrifugal compressors with a hydromechanical fuel control system. The larger Series IV family is identical in layout except for having a single-stage centrifugal rather than an axial/centrifugal compressor.
The latest Series IV turboshafts also feature a FADEC (Full Authority Digital Engine Control) system.