MPGiles,
PA 31 goes OK on 1
If I have correctly read the quotes from some of the witnesses to the last moments of the flight, it sounds as though there were problems with both engines.
Since I heard of this crash the one thing that has nagged me is why a PA31P with only 2 on board and probably full tanks and stretcher kit could not maintain altitude if there was only a single engine problem or failure.
However a double engine problem could well account for the outcome.