The turbine will shut down automatically if it did not see a rx throttle signal for a few seconds (loss of rx power), you do not need to anything there. However rx failsafe also needs set and that will depend on your radio/tx. For example I use frsky and if I left the failsafe set to hold the turbine ecu would never see a loss of throttle signal if I turned off the radio so instead I program the failsafe to receiver and carry out the process of holding the failsafe button with trim down and throttle kill on to teach the receiver to go to "shutdown" on radio switch off. So you basically treat setting failsafe the same as you do for any other powered plane with your particular brand tx.