Originally Posted by
henra
What is not quite clear to me is the question wether and if so how quickly these protections resume once ADR failure has been recovered.
They don't resume, Alt law is latched for the rest of the flight if applicable for more than a short period of time (~10" IIRC).
Only if the ADR failure is really transient would the aircraft revert back to Normal law (and associated protections).
Originally Posted by
USMCProbe
I do have a few questions about this. If the FPV gets "kicked out" by the system, how long does it take to come back?
According to the report, as soon as data needed are back available & limiting contraints no more met.
Originally Posted by
USMCProbe
Was there any indication about how long the FPV was unavailable?
I wonder if one can guess that from the FDR traces. Perhaps with the FD availability?
However:
- The speed as NCD (no computed data / under 60kt) was more than transient => see § 1.16.6.1 of the 3rd report.
- The FPV was asked only shorly by the crew (during the end of the 2:11 minute IIRC), that's in the report.