A question was asked on VAF this morning:

"What does your EFIS NOT display if you lose pitot /static input (for example, blocked due to ice). If the input source is from VHF rather than GPS (you're on an ILS), do you lose attitude? How does the screen display lack of pitot?"

I'm not sure I can fully answer this question, since I'm not flying behind an AFS EFIS yet. But it did peek my curiousity. So what happens when a pitot source becomes unavailable?

thanks,

bob