Patent ID: 8561948

Claim:
A method to ensure the safety of an aircraft flying horizontally at low speed, comprising the steps of: providing an aircraft comprised of: a vertical tail group supporting a tilt-adjustable horizontal tail group that includes elevators, an airscrew provided on an engine supported by a fixed wing of the aircraft, extendable and retractable trailing-edge high-lift flaps on the wing of the aircraft, and a controller configured to control extension and retraction of the high-lift flaps; flying the aircraft horizontally at low speed; orienting said high-lift flaps in an extended position during the horizontal flight of the aircraft; blowing wind generated by said airscrew onto the wing of the aircraft and onto the high-lift flaps oriented in said extended position to generate a nose-down moment; deflecting the tilt-adjustable horizontal tail group during the horizontal flight to generate a nose-up moment and counteract the nose-down moment; and retracting the high-lift flaps by the controller during the horizontal flight, wherein the controller is configured to retract the high-lift flaps at a condition in which an engine thrust signal received by the controller becomes equal to or greater than a predetermined high value that corresponds to the engine thrust needed for the aircraft to take-off.