A very sad day indeed. I have quite a lot of hours in Robinsons, and an Alternator failure was the only issue I ever experienced, thankfully. Hopefully, the surviving pax will be able to give more information as to what happened and allow the AAIB to get to the bottom of why. In the meantime, I wish them a speedy recovery. My thoughts and prayers are with those involved and their families, as well as the operators and the rotary community at this time. It always hits hard and serves as a reminder of the risks we all take in aviation. Rest in Peace.