Leading-edge droop flap

For the drooping nose on supersonic aircraft, see Droop nose (aeronautics).
Airbus A380 approaching to land, with deployed droops visible between the fuselage and the inner engines

The leading-edge droop flap is a device on the leading edge of aircraft wings designed to improve airflow at high angles of attack. The droop flap is similar to the leading-edge slat and the Krueger flap, but with the difference that the entire leading edge section rotates downwards, whereas the slat and Krueger flap are panels which move away from the wing leading edge when it is deployed.[1]

  1. ^ Norris & Wagner (2005), pp.67-68