poor southerners post doesn't give any details about the conditions under which the Arrow 2 lost a wing. Any aircraft can shed bits if you find yourself sufficiently outside the envelope.
If this is the same accident I'm thinking of what actually happened is still a bit of a mystery...the aircraft appeared to be flying normally before breaking up, although it was at close to max weight. Possible rapid control reversal or loss of control caused by distraction while attending to a passenger where given as possible reasons, but it was impossible to know for sure.