Originally Posted by
bearfoil
Initially the PFD's (display) are denied FD (director), it was selected but unavailable. Next comes the failure of the FPV (bird), and all orientation by PFD is eliminated. This implies to me that all attitude (and airspeed) values are not transmitted to the screen; bear
The PFD's may have been red flagged (FPV, SPD LIM, FD) but the interim report states: "no message present in the CFR indicates the loss of displays or of inertial information (attitudes)" (page 41). And no loss of attitude (purely inertial, not based on any air data) has been reported during the past cases of Pitot freezing events.
Jeff