I find some doubts being expressed on auto trim function during unstalling the aircraft. AF 447 remained in alternate2 and never went into direct law so auto trim will function. In Perpignan crash after the crew dropped the speed(purposely for test) it changed to direct law as they lowered the gear and since AoA were frozen they gave erroneous inputs it had trimmed full up. This would need manual forward trim to unstall.During stall exercise with gear down in direct law you do not trim below Vls for the same reason.As they were only at 4000ft and were under lot of pressure they didn't figure that out. In AF447 the stick input to reduce the pitch was never sustained for any length of time. His actions were more like he believed in displayed vertical speed.He would push forward for whatever reason but watching the VS would pull back. So the stabilizer would stay up. He seems to have taken stall recovery action as taught that time with emphasis on minimum loss of height, rather than unreliable speed procedure. It is apparent he never looked at the PFD otherwise he would have lowered the nose at least on the horizon and let it be there for a while.
Last edited by vilas; 7th Oct 2014 at 04:03.