PJ2, MFS, et al, apologies for yet again pushing TAT, but I wish to understand it’s potential (or otherwise) to contribute to the ACARs indications.
Thus seeking your technical expertise; what systems might an erroneous TAT affect? Considering both a large change of TAT - all inputs, or just one system in error and thus the potential to detect the difference?
What systems (computations) use TAT (e.g. ADIRU, rudder limiter via Speed/Mach, etc)?
I note the reported TAT input to the cabin pressure system.
Possible thread relevance to unreliable speed;
http://www.pprune.org/tech-log/37578...ml#post4963257
Note other references to erroneous TAT “… sudden increase in air temperature, from -48ºC to -19ºC …” (#315). This is probably similar to the phenomena reported in an Australian BAe146 serious engine icing incident, which subsequently was revealed to be an indication problem due to frozen TAT probe – no airframe icing, but severe engine/probe icing.