Patent ID: 6898939
Filing Date: 2005-05-31
Classification: F02C,F05D

Abstract:
1. A method for controlling operation of a gas turbine engine using a rotor protection system to prevent a rotor from operating at a speed greater than a pre-set operational maximum speed, the engine including a fuel metering system including a fuel metering valve and a fuel bypass valve, a low pressure drain in flow communication with the fuel metering system, the rotor protection system including a servovalve coupled to the fuel metering system and the fuel bypass valve, said method comprising the steps of: supplying fuel to the engine through the fuel metering valve and a fuel shutoff valve; and controlling fuel to the engine with the servovalve if the fuel metering valve becomes inoperable by diverting a portion of the fuel flowing to the metering valve through the fuel bypass valve when an overspeed condition is detected.