During a mountain rescue, hoisting a casualty aboard resulted in a catastrophic aircraft loss and two fatalities.
A fan blade off event leads to an engine automatic shutdown. The crew shut down the serviceable engine and choose to divert 200 NM further than necessary leading to a forced landing.
A loss of control on approach to a helideck at night that completes a trilogy of case studies where visual cueing at offshore platforms is believed to have been a significant factor.