Originally Posted by
Ahmed Okba
1) Can a governor fail (low side) during a normal cruise flight?
2) What happens if it failed?
3) Would the aircraft start an uncontrolled yaw?
4) How low can the rotor RPM decay?
Not a 412 driver, but your questions seem to be generic.
1) Yes, the indications are initially the same as of an engine failure, except for some alerts and the affected engine stabilizing at a low Ng.
2) It depends on the phase of the flight and power demand. Until malfunction identification and action taken, consider you are OEI.
3) Rare, but at very low airspeeds, if your power demand drops the NR, you may don't have enough TR authority...
4) As low as your collective is pulled up.