US Patent 7140174 Methods and apparatus for assembling a gas turbine engine

A method for assembling a gas turbine engine includes providing a core engine, an inner fan assembly, and a fladed fan assembly, coupling a plurality of airflow ducts to the engine including an inner fan duct for channeling airflow through the inner fan assembly, a core engine duct for channeling airflow through the core engine, a bypass fan duct for channeling the airflow around the core engine duct, a flade duct for channeling airflow through the fladed fan assembly, and a ram duct surrounding an upstream portion of the flade duct, and coupling a plurality of control valves to the engine to control an amount of airflow channeled through each of the ducts using the plurality of control valves.