Inducing windmilling to allow oil flow during fire-induced emergency state

A method for operating an aircraft engine in a fire-induced emergency state, the aircraft engine housed in a nacelle defining a nacelle bypass duct having a first outlet fluidly connected to an inlet of the aircraft engine and a second outlet fluidly connected to an environment external to the nacelle, the method comprising:

• receiving an indication of a fire of the aircraft engine;
• in response to the receiving the indication of the fire in the aircraft engine, initiating an emergency shutdown sequence of the aircraft engine;
• in response to the initiating the emergency shutdown sequence of the aircraft engine, increasing a volume of air entering the inlet of the aircraft engine by restricting air flow through the second outlet of the nacelle bypass duct;
• using the volume of air entering the inlet of the aircraft engine to drive a rotor of the aircraft engine;
• and
• using the rotor to drive an oil pump to circulate oil through a main oil conduit of the aircraft engine.