Leading edge flaps are pneumatically driven, but can also be driven electrically. The LE flaps are signalled from the trailing edge flap position.
There are a total of 26 leading edge flaps. There are 20 Variable Camber leading edge flaps (10×left, 10×right) and 6 Kruger flaps between the inboard engine and the fuselage (3×left, 3×right). The LE flaps are grouped in 4 sets each side: Set 1 (most outboard), set 2, set 3, set 4 (most inboard) TE Flaps 0° - 1°, LE Flaps 2 & 4 signalled and extend TE flaps 5°, LE Flaps 1 & 3 signalled and extend