A method (300, 400) for operating an electric fan of an aft engine of an aircraft propulsion system, the method comprising: driving a plurality of fan blades of the electric fan with an electric machine to generate thrust for the aircraft; and driving the electric machine with the plurality of fan blades of the electric fan to generate electrical power subsequent to driving the plurality of fan blades of the electric fan with the electric machine to generate thrust for the aircraft; wherein driving the electric machine with the plurality of fan blades of the electric fan to generate electrical power comprises modifying a variable geometry component of the aft engine, wherein modifying the variable geometry component of the aft engine comprises modifying the variable geometry component of the aft engine to modify an amount of electric power generated with the electric machine; and the method further comprising: receiving data indicative of a failure condition of one or more components of the propulsion system, wherein modifying the variable geometry component of the aft engine comprises modifying the variable geometry component of the aft engine in response to receiving data indicative of the failure condition; using the electric machine to generate electrical power in response to receiving data indicative of the failure condition; and providing the generated electrical power to the aircraft propulsion system. driving a plurality of fan blades of the electric fan with an electric machine to generate thrust for the aircraft; and driving the electric machine with the plurality of fan blades of the electric fan to generate electrical power subsequent to driving the plurality of fan blades of the electric fan with the electric machine to generate thrust for the aircraft; wherein driving the electric machine with the plurality of fan blades of the electric fan to generate electrical power comprises modifying a variable geometry component of the aft engine, wherein modifying the variable geometry component of the aft engine comprises modifying the variable geometry component of the aft engine to modify an amount of electric power generated with the electric machine; and the method further comprising: receiving data indicative of a failure condition of one or more components of the propulsion system, wherein modifying the variable geometry component of the aft engine comprises modifying the variable geometry component of the aft engine in response to receiving data indicative of the failure condition; using the electric machine to generate electrical power in response to receiving data indicative of the failure condition; and providing the generated electrical power to the aircraft propulsion system. receiving data indicative of a failure condition of one or more components of the propulsion system, wherein modifying the variable geometry component of the aft engine comprises modifying the variable geometry component of the aft engine in response to receiving data indicative of the failure condition; using the electric machine to generate electrical power in response to receiving data indicative of the failure condition; and providing the generated electrical power to the aircraft propulsion system.