On Friday, 3 October 2014 at 18:00:58 UTC, Piotrek wrote:
On Friday, 3 October 2014 at 15:43:59 UTC, Sean Kelly wrote:
This "real life" example:
http://en.wikipedia.org/wiki/Air_France_Flight_447
I just pick some interesting statements (there are other
factors described as well):
"temporary inconsistency between the measured speeds, likely as
a result of the obstruction of the pitot tubes by ice crystals,
causing autopilot disconnection and reconfiguration to
alternate law;"
And as I can see it, all subsystems related to the "small
failure" was shut down. But what is also important information
was not clearly provided to the pilots:
"Despite the fact that they were aware that altitude was
declining rapidly, the pilots were unable to determine which
instruments to trust: it may have appeared to them that all
values were incoherent"
"the cockpit lacked a clear display of the inconsistencies in
airspeed readings identified by the flight computers;"
Piotrek
As one that has read the original report integrally, I think that
you have taken a bad example: despite the autopilot was
disengaged, the stall alarm ringed a pletora of times.
There's no real alternative to the disengagement of the autopilot
is that fundamental parameter is compromised.
It took the captain only a few moment to understand the problem
(read the voice-recording transcription), but it was too late...
---
/Paolo
