Patent ID: 6915639

Claim:
A method for assembling a gas turbine engine to prevent rotor over-speeding, said method comprising the steps of: coupling a fuel system interface including a shutoff shuttle valve to the gas turbine engine such that a selector valve coupled to the shutoff shuttle valve within the fuel system interface is configured to receive an electrically originated over-speed signal inputted from the engine, wherein the fuel system interface is also configured to receive a mechanically originated over-speed signal inputted from the engine; and coupling the fuel system interface shutoff shuttle valve to the fuel system to stop engine fuel flow in response to an overspeed signal received, and based on pre-defined priority selection logic that relates a plurality of different gas turbine engine operating conditions to the received overspeed signal and provides that when the fuel system interface is activated, as a result of receiving an over-speed indication, fuel flow is only initiated when the received overspeed signal is removed.