Boundary layer
Cantilever three-spar structure of modified trapezoid planform. Centre section integral with fuselage. Inboard sections, outboard sections and detachable leading and trailing edges. High-lift devices comprise full-span six-segment leading edge slats (contiguous at engine pylons) at up to 17.5% of chord (drooping to 35°), two-segment fixed-vane double-slotted trailing edge flaps occupying some 75% of the span (deploying to 40°) and five-segment spoilers (outboards used as spoilerons at high speeds, inboards used as lift dumpers on the ground). Two-segment outboard ailerons for low speed roll control. Boundary layer fences over pylons. Engines suspended from the wing on pylons act as anti-flutter weights. Trim range is 16–33% of mean aerodynamic chord.