SilsoeSid,
A good way to start your instructor technical pilot briefing might be to say that no helicopter has FADEC and explain why not
What do you call it then?
The Turbomeca Arriel 2B1 in the AS350B3-2B1(B3+) and EC130B4 has dual channel FADEC and EBCAU (Electronic Backup Control Ancillary Unit) Same with the Arriel 2D in the later model AS350B3e/H125 and the EC130T2/H130
In these helicopters you have no input whatsoever on engine governing, only selecting Flight or Ground Idle after start.
HLCPTER,
If a total FADEC failure occurs, the engine fails
I think not. (in the models above at least)
In case of full FADEC failure (dual channel) the EBCAU takes control automatically, keeping NF within preset value and you'll land as soon as
practicable.