What 'redundancy' does a SE turbine have ?
Not putting words in Gordons mouth, but I think he may be referring to some installations which have a manual fuel mode which the pilot can engage and bypass the automatic functions of the FCU. Would be interested to data on the number of occasions that may have occurred. Have a few thousand hours on PT-6 Twin Pac installation and only once engaged manual fuel in anger to control an overspeed. Deemed to have been caused by ice in a air line on the FCU.