text: angle of attack is changed rapidly, may lead to 
  the impression thal rate of climb and descent 
  can be controlled by changes in angle of attack. 
  While such is true in the region of normal com- 
  mand, for the conditions of stead’ flight, pri- 
  remains the power 
  mary control of altitude 
  setting and the primary control of airspeed re- 
  mains the angle of attack. The impressions 
  and habits that can be developed in the region 
  of normal command can bring about disastrous 
  consequences in the region of reversed com- 
  mand 
  
  The characteristics of flight in the region of 
  reversed command are illustrated at point B 
  on the second curve of figure 6.2. 
  If the air- 
  plane is established in steady, level flight at 
  point B, lift is equal to weight and the power 
  available is set equal to the. power required. 
  When the airplane is disturbed to some air- 
  speed slightly greater than point B, an excess 
  of power exists and, when the airplane is dis- 
  turbed to some airspeed slightly 
  lower than 
  point B, a deficiency of power exists. This 
  relationship is basically unstable because the 
  variation of excess power to either side of 
  point B tends to magnify any original dis- 
  turbance. While the static longitudinal sta- 
  bility of the airplane tends to maintain the 
  original 
  trimmed C, and airspeed correspond- 
  ing to that CL, the phugoid usually has the 
  least satisfactory qualities at the high values 
  of CL corresponding to low speed flight. 