I can think of two fairly large jets being brought down by collision with smaller planes
PSA 727/C172 San Diego, mentioned earlier
DC9/Piper Archer over LA/ Ceritos california.
the small planes involved were much smaller than the large jets involved. the odd thing about this incident is that the legacy survived with such little damage.
perhaps the legacy created a force upon the boeing's rudder, causing a reversal like the crash near Pittsburgh, PA. perhaps the legacy cut vital lines (hydraulic or control)
j