Originally Posted by
USMCProbe
I would like to hear more about the ACARS report saying that the FPV was not working. Does anybody have any info on this? I can't believe a software generated symbol would be "monitored" and reported. The IRU's yes, almost for sure.
From BEA's interim report #2, ACARS analysis:
FLAG ON CAPT PFD FPV and FLAG ON F/O PFD FPV (2 h 11)
Symptoms:
Disappearance of the FPV (bird) on the PFDs, Captain and First Officer sides, and display of the corresponding flag.
Meaning:
This message indicates that the flight path vector (FPV) function is selected but unavailable. In order to lose completely this function, which is elaborated by the three IRs, in a way that is compatible with the CFR, one of the following three conditions must be met for each ADR:
¤ barometric vertical speed higher, as an absolute value, than 20,000 ft/min,
¤ true air speed higher than 599 kt,
¤ measured calibrated airspeed lower than 60 kt.
Once the operating conditions are satisfied again, the FPVs reappear on the PFD (if TRK/FPA mode is still selected).
@ 2h11, for the first time, as CAS lower than 60kt was measured.