| 摘要 |
In order to realize an optimum operating condition of a leading-edge flap, a wind-direction sensor and a load sensor are provided at a leading-edge flap or at each of a plurality of parts of a leading-edge flap divided along the direction of a wing span. An operational control mechanism is also provided for calculating an optimum angle of the leading-edge flap on the basis of information supplied from the wind-direction sensor and the load sensor, and for operating an actuator for varying the angle of the leading-edge flap so as to attain the calculated optimum angle. The wind-direction sensor is preferably either a hot-wire anemometer or a pressure sensor.
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