Originally Posted by
gulliBell
Oh, that comes as a surprise, dual channel failure logic to shut down the engine. In the S76C++ dual channel DECU failure reverts to manual control. Or you can revert to manual control any time you want by flicking a switch. We could even do both engines in manual control in the simulator which was a little bit silly as that was so unlikely to ever happen. But it was a good airmanship exercise for those who could do all the other stuff.
I think it was a question of the cost of installing a back up control system vs the probability of a dual channel failure - could be wrong and maybe JD will comment? Either way, I still don't understand why it could not have just frozen the metering valve. EC155B just froze, then B1 incorporated a back up mode