An aircraft wing , comprising: a structural member disposed at a trailing edge of the aircraft wing and having at least one groove extending along a length between a forward extremity and an aft extremity , a forward segment of the at least one groove disposed at a forward end thereof and extending upwardly to the forward extremity , the forward extremity being a highest point of the at least one groove ; at least one flap carriage mounted to the at least one groove and displaceable therealong between the forward and aft extremities; a flap extending between a flap leading edge and a flap trailing edge , the flap being pivotably attached to the at least one flap carriage to define at least one flap pivot axis about which the flap is rotatable, the flap being displaceable with the at least one flap carriage ; and an actuator having a housing and an arm with a distal end mounted to the at least one flap carriage , the arm being extendable relative to the housing between an extended position and a retracted position to displace the at least one flap carriage along the at least one groove , the at least one flap carriage in the retracted position being disposed in the forward segment of the at least one groove and the flap being rotated about the at least one flap pivot axis to position the flap trailing edge in negative flap deployment; wherein the at least one groove has an aft segment extending in an aft direction from the forward segment to the aft extremity , the aft segment being lower than the forward segment , the at least one flap carriage in the extended position being disposed in the aft segment and the flap being rotated about the flap pivot axis to position the flap trailing edge in positive flap deployment. a structural member disposed at a trailing edge of the aircraft wing and having at least one groove extending along a length between a forward extremity and an aft extremity , a forward segment of the at least one groove disposed at a forward end thereof and extending upwardly to the forward extremity , the forward extremity being a highest point of the at least one groove ; at least one flap carriage mounted to the at least one groove and displaceable therealong between the forward and aft extremities; a flap extending between a flap leading edge and a flap trailing edge , the flap being pivotably attached to the at least one flap carriage to define at least one flap pivot axis about which the flap is rotatable, the flap being displaceable with the at least one flap carriage ; and an actuator having a housing and an arm with a distal end mounted to the at least one flap carriage , the arm being extendable relative to the housing between an extended position and a retracted position to displace the at least one flap carriage along the at least one groove , the at least one flap carriage in the retracted position being disposed in the forward segment of the at least one groove and the flap being rotated about the at least one flap pivot axis to position the flap trailing edge in negative flap deployment; wherein the at least one groove has an aft segment extending in an aft direction from the forward segment to the aft extremity , the aft segment being lower than the forward segment , the at least one flap carriage in the extended position being disposed in the aft segment and the flap being rotated about the flap pivot axis to position the flap trailing edge in positive flap deployment. <EOS>