If the situation is an
unscheduled feather (ie
not initiated by the autofeather system), there would most likely
not have been an "Np underspeed cancel" signal sent to the EEC/ECU. This would probably result in an over-torque situation. However, there should be a backup Np underspeed cancel signal sent from the torque gauge, once the torque rises above 120%.
120% is way below that required to kill a PW123E.
Having such an event can't bother
Bombardier too much. Their recall basically requires no action below plateau height.
That's my understanding. I'm happy to be corrected by you more learned types
