A320 Main Components (FLAPS)
Pressure-off brakes (POBs) lock the transmission when the slat or flap surfaces have reached the selected position or if hydraulic power fails.
Wingtip brakes (WTBs), activated in case of assymetry, mechanism overspeed, symmetricalrunaway, or uncommanded movement of the surfaces.
Can some one explain the difference between the two? If the Pressure-off brakes (POBs) lock the transmission how can there be uncommanded movement of the surfaces?
Also A flap disconnect detection system, which detects attachment failure and inhibits flap operation in order to prevent further damage.What would cause this ? A Bird Strike