FIELD: aviation. SUBSTANCE: wing is provided with noise level reducing unit made in form of flap. Specific feature of this flap consists in availability of at least one lateral face provided with smooth curvilinear continuous surface which reduces turbulence in fluid medium when it moves from lower surface of flap to its upper surface. Lateral face of flap may be made with rounded-off surface having shape of semicircle. Method of reducing noise consists in manufacture of flap with lateral face described above. EFFECT: enhanced efficiency of nouse reduction at take-off and landing. 10 cl, 18 dwg
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