Abstract: In one embodiment, an apparatus is provided for covering and uncovering a flap opening in an aircraft. The apparatus comprises a door member, a torque tube roller member, at least one roller member, and a biasing member. The door member may be adapted to cover and uncover a flap opening. The torque tube roller member may be attached with the door member, and may be adapted to be pushed by a torque tube member attached with a flap of an aircraft. The door member may be adapted to be driven from a closed position covering a flap opening into an open position uncovering a flap opening. The roller member may be attached with the door member and may be adapted to follow at least one track member. The biasing member may be attached with the door member for biasing the door member towards a closed position covering a flap opening.