text: First to consider is that any positive lift will 
  support a part of the airplane weight and reduce 
  the normal force on the landing gear. Of 
  it 
  course, for the purposes of braking friction, 
  would be to advantage to create negative lift 
  but this is not the usual capability of the air- 
  the tricycle landing gear. Since 
  plane with  The combined effect of flap retraction and 
  aft stickis a significant 
  increase in braking 
  friction force. Of course, the flaps should not 
  be retracted while still airborne and aft stick 
  should be used just enough without 
  lifting 
  the nosewheel off the runway. These tech- 
  niques are to no avail if proper use of the 