Refer to figure.
ICE CONTROL SYSTEMS
Two major categories of ice control systems are pneumatic boots – which expand and break ice off aerofoils; and thermal systems – which use bleed air or electricity to heat protected surfaces and prevent ice. To protect wing and tail surface leading edges from icing, most aeroplanes use pneumatic devices. On many reciprocating-engine and turboprop airplanes, de-icing boots are pneumatically inflated to break the ice, which allows it to be carried away by the airstream. In another system, primarily used by turbine-powered aeroplanes, heated air is directed through ducting in the aerofoil leading edge, to thermally prevent ice from forming. This is referred to as thermal anti-ice system.

• De-icing boots
  A high-pressure de-icing boot is a fabric-reinforced rubber sheet that contains built in inflation tubes. The boots are installed in sections along each leading-edge surface. On wings and horizontal stabilizers, corresponding sections on the left and right side of the aeroplane operate simultaneously to provide symmetrical airflow between both sides of the aeroplane.