A stall warning occurs when the angle of attack (angle between the wing and the airflow) is too high to maintain lift. There is a separate instrument for detect

A stall warning occurs when the angle of attack (angle between the wing and the airflow) is too high to maintain lift. There is a separate instrument for detecting this (which can also be disabled by ice build up, but appeared to be working here). Low airspeed is not the only condition for a stall - it can happen even at high speed!