The problem is that the mechanisms that hold the flaps in place can be damaged resulting in loss of control over the surface. Sometimes a flap on one side of th

The problem is that the mechanisms that hold the flaps in place can be damaged resulting in loss of control over the surface. Sometimes a flap on one side of the plane will be damaged and, when you go to retract the flap, the plane will start to roll. Also the flaps can be torn off the plane.