text: The pilot induced oscillation is most likely 
  under certain conditions, Most obvious is the 
  case of the pilot unfamiliar with 
  of the airplane and likely 
  to overcontrol or 
  have excessive response lag. High speed flight 
  at low. altitude (high 4) is most likely 
  to 
  provide low stick-force gradients and periods 
  
  the “feel” 