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On a large transport aeroplane, the auto-slat system:
  • A
    ensures that the (part of) slats are always extended when the ground/flight system is in the “ground” position.”
  • B
    provides for automatic slat retraction after take-off.
  • C
    assist the ailerons.
  • D
    extends (part of) the slats automatically when a certain value of angle of attack is exceeded.

Slats
Slats are aerodynamic surfaces on the leading edge of the wings of fixed-wing aircraft which, when deployed, allow the wing to operate at a higher angle of attack. A higher coefficient of lift is produced as a result of angle of attack and speed, so by deploying slats an aircraft can fly at slower speeds, or take off and land in shorter distances. They are usually used while landing or performing manoeuvres which take the aircraft close to the stall, but are usually retracted in normal flight to minimize drag. They decrease stall speed.

Some aircraft have an autoslat function which will extend the slats automatically if the wing is about to stall. Usually this autoslat function has some conditions before it will function which can be airspeed, flaps and slats settings. When the stall condition ceases the autoslat system will retract the slats.

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