Originally Posted by CONFiture
How stall warning didn't supercede that condition ... ?
That question should be and will be forwarded to human factors experts.
If you'd like to suggest that stall warning should automatically stop the trim dead, it's a bad idea. If THS helped one get near or into the stall, last thing he needs is frozen trim - it must help one out of the edge of envelope too. I simply can not mention name of David Pettit Davies - a superb pilot, brilliant writer and overall a great man - enough times in this thread.
Originally Posted by jcjeant
So certainly with the insight of the AF447 accident you must think that the pilots were in very bad luck for have the 3 Pitot tubes frozen dead ..
You have correctly interpreted part of my post. We know that "bad" ice that sticks to heated metal parts of the aeroplane, like TAT probes, pitots and engine compressors can be found in turbulent area near CBs but chances of finding it in aforedescribed areas are one to unknown, unknown being estimated as quite high. We only have anecdotal evidence that one type of probes is more often affected by "bad ice crystals" than other. We don't know why they get blocked but we're replacing them to avoid further incidents, which is quite reasonable and does not imply that probes are faulty. They just cannot cope with conditions met only very rarely in flight and there is no chance of replicating them in test conditions.
Originally Posted by jcjeant
And also with the insight of AF447 accident .. you must think that if they avoided the CB plume by hundred miles .. the schedule was a joke .. but the passenggers and crew will be alive today .. commenting about their delay at arrival .....
That's a severe misinterpretation, sir. Flying is extremely hazardous enterprise and while appearance of thunderstorm clouds near desired route brings hazard level one notch up, overall risk increase is only slight. Sure, those CBs in ITCZ will certainly kill you if you fly into them but only those ignorant of way aviation works will make a drama out of it. There are hundreds of flights daily through ITCZ , there are thousands of deviations around CB every day and every now and then loss of airspeed indications ends up as brief note in airline safety bulletin, passengers being largely ignorant that their flight was anything but ordinary. So we as pilots do everything right most of the time.
Icing of the pitots was freak incident. Crew's reactions were unbelievable. Investigation moves into HF field.
There's excellent editorial in jul-aug issue of Aviation Safety World. Everyone, do yourselves a favour and read it.