Auto-rotation is the capability helicopters have of moving its rotor while umpowered. It is used in emergency situations when the helicopter engine turns off for some reason. In order to be able to initiate the auto-rotation, the pilot must be very quick (and trained) to configurate the controls to allow it. There are some requirement of altitude and speed to initiate the auto-rotation, since it depends on making the rotor keep on moving thanks to the front wind in the blades, while descending and advancing. If this altitude and speed are available, there is not much the pilot can do.
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