Honeywell International Inc.

David D Jones

Timothy D Mahoney

Christopher Douglas Eick

William Lorenz

A fuel system () for a gas turbine engine () having a shaft () and requiring fuel to be supplied at a first rate for engine start up, the fuel system () including: a main fuel pump () for providing fuel to the gas turbine engine (), the main fuel pump () having an output varying with shaft speed, the output being at a windmilling rate when the engine () is windmilling, the windmilling rate being less than the first rate; and an auxiliary fuel pump () for providing fuel to the gas turbine engine () and having an auxiliary output rate greater than or equal to the difference between the first rate and the windmilling rate. A method of operating such a fuel system () is also disclosed.

Reduced-weight fuel system for gas turbine engine, gas turbine engine having a reduced-weight fuel system, and method of providing fuel to a gas turbine engine using a reduced-weight fuel system

A system for controlling the flow of fuel to a gas turbine engine is operable in at least two modes. In a first mode, the flow rate of fuel supplied from a fuel source to the combustors of the turbine engine is controlled by modulating the position of a metering valve. A controller determines the controllability of the metering valve and, if it is determined to be non-controllable, then the system is operated in the second mode. In the second mode, the flow rate of fuel supplied to the combustors is controlled by modulating the position of a bypass valve.

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Granger, IN, United States of America

David D Jones