Originally Posted by Diagnostic
I was only replying to (what I believe) Clandestino was saying, where he seemed to be saying that if 32 other crews could manage clogged pitots successfully, then AF447 was the exception.
You have interpreted me kind of correctly, sir. I was pretty serious when I mentioned curves of crew performance available vs required. It is possible that some of the crews exposed to the pitot icing under the circumstances of AF447 crew would have gone through the same motions and ended up similarly. It is possible that AF447 crew would have made much better job under more favourable circumstances, however such speculations are only useful if they bring us closer to answer why the crew did what they did. Only when this is answered we can proceed to "How do we prevent it in the future?"
Number 32 was often quoted in threads referring to AF447. I was able to trace it as far as PBS show "Crash of flight 447". Interim report #2 refers to 33 cases preceding AF447 and four occurring afterwards. In those cases that could be further analyzed, crew pushed forward when faced with stall warning, CM2 of AF447 pulled and kept pulling. My entirely subjective criterion of exception is thus met.
Originally Posted by Svarin
Read the report in full, including page 1xx where you will find the rudder traces
Actually it is Interim report 3, page 112, Lateral parameters.
Originally Posted by Svarin
There is a definite APC event in this instance, in roll and yaw. Rudder played a huge part, as a fast-moving, oscillating control surface with zero feedback to the pilots.
There is not in yaw.
To have PIO/APC you have to start with pilot's oscillatory input. Rudder starts to oscillate without pilot's input at about 2:11:45 (following yaw damper commands) when the aeroplane is so deeply stalled that high AoA and low speed make it pretty inefficient. There's fast pedal movement to the left at approximately 2:13:05, followed by sharp reversal to the right and return to neutral over next minute. No oscillatory inputs. No APC. Just an aeroplane gently mushing in stall.
Originally Posted by Svarin
Yes, looking at the traces is dull work. But as long as we take these recorders for the truth of the matter, the traces are all we have as unbiased data, along with the ACARS messages. Unless one is prepared to use and study them carefully, one can only follow pre-made conclusions written under careful supervision by interested parties. Such should not satisfy an inquiring mind.
I could not put it better myself, sir.