Well, at the end the TOT sensor had failed - thats why I took the picture, to give the engineers as much information as possible to track down the problem.

As cool as it is, to have a powerful helicopter with lots of useful gadgets - sometimes the computers f... up when switching the BatMaster on.
Sometimes it helps, to switch it off again, wait for 30 seconds and switch it on again, to clear messages, which would otherwise prevent a start.....