text: When normal autorotation has been estab- 
  lished, a normal power recovery from the auto- 
  rotation can be made. While such a recovery 
  technique is effective, considerable altitude 
  may be lost. Hence, diving out of the power 
  settling condition provides the most favorable 
  means of recovery. 
  
  “power 
  are quite rare. A condition often 
  settling” 
  described incorrectly as “power settling” 
  is 
  merely a high sink rate as a result of insufficient 
  power to terminate an approach to landing. 
  This situation frequently occurs during high 
  gross weight or high density altitude operation. 
  The flow conditions within 
  the rotor are quite 
  normal and there is merely insufficient power 
  to reduce rate of descent and terminate an 
  approach. Such a situation becomes more 
  critical with a steep approach since the more 
  to 
  rapid descent will 
  terminate the approach. 
  
  Actually,  real  instances of  true 
  
  state is a 
  transient condition and the helicopter will 
  seek equilibrium by descending. As the heli- 
  copter descends, a greater upflow through the 
  disc results until eventually the flow is entirely 
  up through the rotor and the rotor enters auto- 
  rotation where lower rates of descent can be 
  considerable alti- 
  achieved. Unfortunately, 
  tude will be lost before the autorotative type 
  of flow is achieved and a positive recovery 
  technique must be applied to minimize the loss 
  of altitude. 
  can be recog- 
  nized by rotor roughness, loss of control due 
  to the turbulent rotational 
  flow, and a very 
  high rate of descent (as high as 3,000 fpm). 
  to be encountered inadvert- 
  It is most likely 
  ently when attempting 
  to hover when suf- 
  ficient power is not available because of high 
  gross weight or high density altitude. 
  
  “Power settling” 