Originally Posted by
Zorin_75
More precisely, in this state the system thinks it's less smart than the pilot therefore it will do as told without protest.
Sorry, but if you are going to claim to be precise - the system doesn't
think anything at all.
Some people here seem to be ascribing far more complexity and "intelligence" to the aircraft systems than is actually present.
This is leading them into the trap of blaming the designers for not considering rule A (do not trim up if AOA >X, Alt = Y, airspeed = Z) which apparently is perfectly obvious (with hindsight from an armchair - 3 real pilots on the night didn't find it obvious...). Thinking the designers screwed up because the system is too complex, they demand it be made simpler, not realising that it is already far simpler than they realise, and far too simple to implement the rules they've asked for.
The autotrim simply moves THS, limited by stops, to unload the elevator - with a bit of hysteresis thrown in (probably thresholds on elevator displacements and time).
The pilots may stop / override autotrim, and other systems on the plane may stop autotrim. Various protections may stop (or limit) the autotrim, and the higher level mode/law state may switch those protections on or off, or switch off autotrim itself (off in direct law).
Autotrim did what the pilots asked simply because that is what it does, and nothing told it to stop. It didn't look at the pilot input and the AOA and the current law/state and
decide it oughtto move because law=alt even though AOA > stalled.