The New Lucas Fuel Control System for the Rolls-Royce Spey Engine

A new fuel system has been developed for the Spey engine. The system uses rotating metering valves controlled directly from engine signals together with a variable-stroke fuel pump which incorporates an improved servo control giving very fast response with stability. Nondimensional acceleration and deceleration control are obtained without the need for air temperature measurement. The integration of the pilot's full-range speed governor with the acceleration control produces isochronous governor performance without the use of additional reset devices. The system is accurate over a range of fuels, is easily calibrated, and will tolerate fuel contamination. Moreover, the simplicity of its design will promote reliability and reduce operating costs.