Split Flap

Description

An asymmetric or split flap condition is one in which the flap(s) on one wing extends or retracts while the one(s) on the other wing remains in position. The situation can be caused by mechanical failure or jamming.

If the situation is allowed to progress unchecked, it will result in a pronounced roll towards the wing with the lessor amount of flap extended. In this case, it is possible that the induced roll could exceed the amount of aileron authority available and could result in a spin or other loss of control situation. In all cases of asymmetric flap, the wing with the greater amount of flap extended produces more lift. As a consequence, the wing with the lessor amount of flap extended will stall first.