Patent ID: 6619027
Filing Date: 2003-09-16
Classification: F02C,F05D

Abstract:
A rotor overspeed protection system for a gas turbine engine, the engine including an independent speed sensing system providing an indication of rotor speed to the rotor overspeed protection system, said rotor overspeed protection system comprising:a fuel metering system comprising a fuel metering valve, a fuel shutoff valve, and a fuel bypass valve coupled in flow communication; and a servovalve in flow communication with said fuel metering valve for receiving a signal indicative of rotor speed from the independent speed sensing system and operable to divert fuel from said fuel metering valve through said servovalve to control rotor speed when a rotor overspeed condition is sensed by the independent speed sensing system, said servovalve is further configured for diverting a portion of fuel flowing from said fuel metering valve to a low pressure drain in flow communication with said fuel bypass valve.