| Autoslats At flap positions 1, 2 and 5 an autoslat function is available that moves the
LE slats to full extended if the airplane approaches a stall condition.
The autoslat system is designed to enhance airplane stall characteristics at high angles of attack during takeoff or approach to landing. When TE flaps 1 through 5 are selected, the LE slats are in the extend position. As the airplane approaches the stall angle, the slats automatically drive to the full extended position prior to stick shaker activation. The slats return to the extend position when the pitch angle is sufficiently reduced below the stall critical attitude. Autoslat operation is normally powered by Hydraulic System B. An alternate source of power is provided by System A through a Power Transfer Unit (PTU) if a loss of pressure is sensed from the higher volume System B engine driven pump. The PTU provides System A pressure to power a hydraulic motorized pump, pressurizing System B fluid to provide power for the autoslat operation. |