If both TAT probes are showing the same temperature, but the engine sensors are showing something different, how do the EEC's (CF6) know which source to select? (my manuals are not clear on this).
From memory, the EEC's have Prim & Sec computation sections that only use data from local sensors to do all its own calculations, only if there is a internal voting error does the EEC look at A/C data, Prim at L ADC & Sec at R ADC. If there is an error with external data, the EEC will use internal generated assumed data using the local sensors available to it. Not too sure off hand if this is RR or GE or both (similar).