text: In the case of power-off glide performance, the 
  thrust, T, is zero and the relationship reduces 
  to: 
  
  D 
  W 
  sin y= -- 
  
  By this relationship it is evident that the mini- 
  mum angle of glide-or minimum negative 
  climb angle-is obtained at the aerodynamic 
  total 
  conditions which 
  drag. Since the airplane lift is essentially equal 
  to the weight, 
  the minimum angle of glide 
  will be obtained when the airplane is operated 
  at maximum lift-drag ratio, (L/D)ma,. When 
  the angle of glide is relatively small, the ratio 
  of glide distance to glide altitude is numeri- 
  cally equal to the airplane lift-drag ratio. 
  
  Significant vertical and horizontal gusts may 
  be due to the terrain or atmospheric conditions. 
  The proximity’of an unstable front or thunder- 
  the vicinity of the airfield is 
  storm activity’in 
  likely to create significant wind shear and gust 
  activity at low altitude. During gusty condi- 
  tions every effort must be made for precise con- 
  trol of airspeed and flight path and any changes 
  due to gusts must be corrected by proper con- 
  trol action. Under extreme gusts conditions, 
  it may be advisable to utilize approach, land- 
  ing, and takeoff speeds slightly greater than 
  normal to provide margin for adequate control. 