Thanks Xair. I might have a peek under the cowling then.

But if it's only a matter of the RPM sensor being 'plugged in the wrong way', couldn't I acheive the same thing by just plugging the RPM sensor lead into the FADEC the other way around? Or has it got more to do with the Hall Effect transistor versus the Pulse Magnet orientation?

Either way, the Turbine was supposed to have been 'test fired' before shipment - surely it wouldn't have worked for them either if the RPM sensor was the wrong way around?

BJ