The author describes the evolution of his company’s digital control approach to the Pegasus engine as applied to a single engined VTOL aircraft. The paper describes the digital control system being built by Dowty and Smiths Industries Controls Limited (DSIC). The design is based on extensive engine evaluation of different control configuration with electronic and hydromechanical back-up system. The paper describes the mechanical design, installation on the engine and the cooling of the system including the choice of basic packaging concept. It also discusses the rationale for the particular choice of back-up system and the reliability/safety of flight trade-offs involved.

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