In the case of an engine failure the rotation of the main rotor slows down and he is no longer able to provide the necessary lifting force. However, the helicopter can be planted safely thanks to the procedure, which is called rotation. The pilot lowers the modular switch of a step, using the edge of the blades is slightly bent down. By reducing the helicopter of the air that bends around the blades, continues to rotate in the appropriate direction. Therefore, when the helicopter is approaching to land, the pilot again slightly raises the edge of the blades to provide lift force sufficient to slow the descent before landing.
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