Patent ID: 8721406

Claim:
An air duct for supplying ambient air in an aircraft, comprising: an air inlet, a flow duct portion extending downstream of the air inlet, a feed device that is devised to feed ambient air through the air inlet and the flow duct portion, and a flow control flap comprising a first surface portion extending from a first terminal end to a junction point and a second surface portion extending from a second terminal end to the junction point, the flow control flap movable to at least first, second, and third positions via rotation about a pivot axis, with the pivot axis located between the first and second surface portions such that the pivot axis is positioned between a first plane defined through the first and second terminal ends and a second plane parallel to the first plane and defined through the junction point, wherein in the first position, the flow control flap closes the air inlet; in the second position, the flow control flap releases a first flow cross section of the air inlets; and in the third position, the flow control flap releases a second flow cross section that is larger than the first flow cross section, wherein the flow control flap is so designed and disposed that in the second position, the first surface portion is aligned in the region of the air inlet substantially parallel to and substantially flush with an aircraft outer skin portion surrounding the air inlet, and in the third position, the first surface portion is aligned in the region of the air inlet at an angle to the aircraft outer skin portion surrounding the air inlet.