4,000' x 100' Runway 1,600' From Threshold 100' Altitude Same Runway, Same Approach Angle 800' From Threshold 50' Altitude Same Runway, Same Approach Angle 400' From Threshold 25' Altitude Too High Too Low Desired Descent Angle Figure 11-20. Change in runway shape if approach becomes  narrow or steep. Figure 11-19.  Runway shape during stabilized approach. 11-12