Hi HN39,
Do you assume the captain did not hear the warning when he entered the Flight Deck?
If he did hear it initially, shortly afterwards it stopped. I would guess that he assumed the crew had "respected" the stall warning and the aircraft was no longer stalled. It would take some time to absorb what he was witnessing and diagnose a continued stall (especially without the stall warning).
It's a pity that the stall warning sounded again after they made the correct (ND) input.
Hi jcjeant, - I can only explain the stab trim remained full NU, if the pilot inputs were mostly NU. If the full report shows they were attempting to unstall the aircraft with nose down inputs - but the stab remained full nose up - then AB have a huge re-design problem. I don't think that's the case.