Originally Posted by
ASRAAMTOO
Original post said indications of 0% rather than no indications so I would tend towards severe damage rather than missing. Coming at this from a logical point, look at what the differences are between the two checklists?
It depends on the exact engine/aircraft combination, but even most FADEC engines have a 'backup' analog input for N1 and/or N2. If the engine is physically gone, the analog input will indicate zero, not 'invalid' or a blank display (which loosing the FADEC connection would do). So a 'zero' indication (rather than a blank display) is no assurance that the engine is still there.