AIRCRAFT PROPULSION SYSTEM

Technology for operating an engine smoothly is provided. In an aircraft propulsion system, a controller (100) causes at least a first engine (60-1) among the plurality of engines (60) to be stopped and causes a second engine (60-2), which has not been stopped, to be operated when an aircraft is flying in a prescribed flight mode and causes the first engine to be operated and causes the second engine to be stopped when a detector (52) detects that the temperature related to the first engine is less than or equal to a first prescribed temperature.