Aircraft engine with lubricant system having windmilling configuration

An aircraft engine for a multi-engine aircraft, comprising:

• a low-pressure assembly including a low-pressure turbine drivingly connected to a rotatable load, the low-pressure assembly having first components engaged by, and configured to assist rotation of, the low-pressure turbine and the rotatable load, the first components being susceptible to rotation by windmilling and having first inlets and first scavenge outlets;
• a high-pressure spool rotating independently of the low-pressure assembly and including a high-pressure turbine drivingly connected to a compressor, the high-pressure spool having second components engaged by, and configured to assist rotation of, the high pressure turbine and the compressor, the second components having second inlets and second scavenge outlets;
• a lubricant system operatively connected to the first components and the second components, the lubricant system having:
• a lubricant tank containing a volume of lubricant;
• a main pump and a scavenge pump operable to drive a flow of the lubricant from the lubricant tank to the first inlets and the second inlets and from the first scavenge outlets and the second scavenge outlets back to the lubricant tank;
• a secondary pump;
• and
• valves selectively fluidly connecting or disconnecting the first inlets of the first components to the main pump or to the secondary pump and the first scavenge outlets to the scavenge pump or to a lubricant source;
• the lubricant system having:
• a standard configuration in which the valves are configured to define a standard flow path extending from the lubricant tank to the first inlets and the second inlets via the main pump while bypassing the secondary pump, and from the first scavenge outlets and the second scavenge outlets to the lubricant tank via the scavenge pump;
• and
• a windmilling configuration in which the valves are configured to define a windmilling flow path extending from the lubricant source to the first inlets via the secondary pump while bypassing the main pump, and from the first scavenge outlets to the lubricant source while bypassing the scavenge pump.