Originally Posted by
HazelNuts39
In your account of the BBC documentary on AF447:
I wonder, did they mention stall warning, and why it was ignored?
HN39
Their scenario is that in turbulence penetration, thrust is reduced below required power for flying pitch+power in the event of unreliable airspeed. Lack of direct feedback from non-moving throttles was mentioned, together with the high workload + alarms (in general) leading to pilots being slow to appreciate that power is below that needed. They state that this is born out in previous unreliable airspeed incidents, where pilots took 60secs to set power.
No mention of stall warning specifically. I can imagine it would be quite easy to ignore stall warning if you already believe the plane doesn't have a clue how fast it's going anymore.
The BBC had limited time, to go into everything, particularly when trying to get in as much dramatic commentary as possible...
They may well have filmed discussion on stall warning and then cut it.
There was very little on the VS also - basically taken as read the BEA conclusion that it was still attached at impact. There's probably enough material on the VS on this thread to make an hours television
just on that subject - however the interested audience would then be a bit more limited!
Not a
bad program at all (certainly not
full of hype or innaccuracies), but equally it doesn't bring anything new if you've already read this thread (for instance).