This is flap.flap is a hinged metal surface marginal plane. his usual flap can be found in the middle of the plane wing on the back / end. This flap can usually be moved lengthwise and then moves down the function of this flap is to reduce the speed dropped by adding kamber wing and thereby increasing the maximum lift coefficient of lift so the plane easier to lift the fuselage or landing perfectly. lowered when the aircraft flap want take off / landing. slope of the flap is 5,10,15,20,40 degrees. when the plane wants to fly pilots usually lower flap 5 degrees. whereas if the aircraft to landing flap down 40 degrees / (full retraced).
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