text: NAVWEPS 00-802-80 
  STABILITY ,AND CONTROL 
  
  to zero. When an aircraft is in equilibrium, 
  there are no accelerations and the aircraft 
  continues in a steady condition of flight. 
  If 
  the equilibrium is disturbed by a gust or deflec- 
  tion of the controls, the aircraft will experi- 
  ence acceleration due to unbalance of moment 
  or force. 
  
  aircraft from some trimmed angle of attack. 
  If the aerodynamic pitching moments created 
  by this displacement tend to return the air- 
  craft to the equilibrium angle of attack the 
  aircraft 
  longitudinal 
  stability. 
  
  has positive  static 
  
  DYNAMIC STABILITY 