Shytorque, you may well be right (and yes A109 blades do have significant washout) but as I recall the inboard trailing edge flap was introduced on the early 'C' model. It was a trial initiated by Mario Ceriani and Paolo Ferreri at Agusta Aviation Corporation (to the chagrin of the design aerodynamicists at Cascina Costa!) and was there to kill lift generated by the (then) new profiled blades that had an increased bull-nose on the leading edge at the root. This generated lift and 'patter' at a frequency of 4R over the redesigned & straked aft cowling. The trailing edge slat addessed this generated vibration very well, particularly at high cruise (140+knots)
I offer it as a thought only
