Powered by: Rolls Royce 250-C20B


Rolls Royce 250 Series


Fleet Hour Agreement (PDF)


Significant facts (PDF)


Rolls Royce publishes the Rolls Royce Rotor Report for Model 250 customers.



FH1100 showing 250 engine with engine deck cowling in the open postion.

16,000 In Service Worldwide



The (Model 250-C20B) turboshaft engine powers many of the worlds most popular helicopters including the FH1100.


The Model 250 turboshaft family of engines are of two-shaft modular design, with power ratings ranging from 420-715shp.


More than 29,000 Model 250s have been delivered to date, with an estimated 16,000 engines currently in service.


In 2003, the Model 250 celebrated the unprecedented milestone of 160 million flight hours, setting new standards of operability and safety.


Originally developed as the T63 to meet a US Army requirement for a 317shp turboshaft, the original Series Model 250 has spawned an entire family of small turbine engines, including turboshafts, turboprops, industrial/marine starter-generators and disposable turbojet derivatives.

Technical Details



The Model 250 Series II turboshaft engines feature four- to six-stage axial and single-stage centrifugal compressors, a two-stage LP turbine, two-stage HP turbine with a hydromechanical fuel control system, and a gearbox with 6,000rpm output.

Compressed air is routed to the aft end of the engine for combustion, with exhaust gases exiting upward from the middle of the engine.