R. Cal
Thanks for your reply, but you might have missed in my description that the engines are off....so no N1 anyway. I am aware of the dual sensors on the phonic wheel and the frequency proportional signal from the DECU engine alternator all provide N1 signals. And when we are running, no problems, all indications are fine and the test shows the backup N1 signal is within 0.2. But curiosity was aroused when pressing the test with the engines off I got a code I can't find any info on.
rANO doesn't seem to fit any scenario I dream up??
Nothing in the 2S1 training manual either that I can find.
Geoff