With glass panels, it's important to understand what drives the PFD data, and what conditions will cause failure. Aspen's popular EFD1000-series shares the pitot and static lines with the standby airspeed and altimeter. A blockage means bogus information on all of them. Aspen uses both static and pitot pressure for calculating ADAHRS data. Erroneous input will affect the accuracy of airspeed, altitude and attitude data. If this seems like putting all the eggs in one basket, it is.
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