Methods and apparatus for over-speed protection of a gas turbine

A fuel system interface (36) for a gas turbine engine (10) prevents a rotor from over-speeding and receives either an electrically-originated or a mechanically-originated over-speed signal (72, 74, 76). In the exemplary embodiment, the fuel system interface is coupled to an gas turbine engine fuel shut off valve (44) and to a fuel metering valve to shut off engine fuel after receiving an over-speed condition. As a result, because the fuel system interface acts on both the shut off valve and the fuel metering valve, rotor over-speed protection is facilitated with parallel redundant fuel cutoff devices.