The Allison Model 250, now known as the Rolls-Royce M250, (US military designations T63 and T703) is a highly successful turboshaft engine family, originally...

performed the first flight of a turboprop-powered SF.260TP, powered by an Allison Model 250 engine flat-rated at 350 shp. This variant was marketed towards the...

school in 1979. Allison Turbine Mentor Conversion of surplus T-34 Mentors to be powered by Allison Model 250 turboprop engines. Model 73 Jet Mentor Powered...

and custom builder, to head the project. Early models were powered by a Rolls-Royce-Allison Model 250-C18 gas turbine producing a claimed 320 hp (240 kW)...

the Japan Maritime Self-Defense Force. Fuji refitted a KM-2 with an Allison Model 250 turboprop engine in place of the original Lycoming piston engine,...

outfit it with a pair of Allison 250-C14 turboshaft engines. While early considerations had been made for a militarised model, which the company internally...

157 kg) normal MTOW 3,000 lb (1,361 kg) overload MTOW Powerplant: 1 × Allison Model 250-C20B turboshaft engine, 420 shp (310 kW) Main rotor diameter: 26 ft...

rotor (the MD 520N has a five blade unit) and an uprated Allison (now Rolls-Royce) Model 250 turboshaft. The prototype was modified to MD 600N standard...

include a modified fuselage with more pointed nose, new engines (Allison Model 250-C20B turboshaft engines) each rated at 313 kW (420 hp), new composite...

operators of the FH-1100 were impacted by a serious issue with the Allison Model 250-C18 turboshaft powerplant it used, the exhibited failure rate was...