The issue focused on how long an emergency landing may take if an airplane goes down at low speed. 
 
 An airplane going down at 30 mph will need a quick climb to stay airborne. To test this idea, they tried it at sea level with a glider. As you can see, it takes about 12 seconds for the glider to reach a height of 50 ft. So if an airplane goes down at 30 mph at sea level, it will take almost 12 seconds for it to reach a height of 50 ft. 
 
 However, if it goes