Port wing inboard section prepared as a boundary layer control system showpiece (front to the right).
Hot engine bleed air is fed into a titanium plenum tube and blown through a slot nozzle located at its top.
The resulting sheet of hot air blown down the upper surface of the flap effectively eliminates any flow separation,
thus allowing for a larger flap angle and facilitating a higher lift coefficient.
However, in case of an engine failure on finals, the neat flow system collapses and the aircraft drops like a rock.