English: Animation of an accelerated stall. The aircraft is flying at constant speed (IAS or Indicated Air Speed) along a circular trajectory with decreasing turn radius (i.e. is turning and increasingly tightening the turn). In order to keep the trajectory, more and more lift is needed (since it must equal the sum of weight and centrifugal force), which can be achieved by increasing the Angle of Attack (that is pulling back on the stick). When the critical Angle of Attack is reached, any further increase results in a stall, even if the airspeed has not changed. Note that a stall would not occur if the aircraft was flying straight and level at the same speed, hence the term accelerated stall.