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Old 16th Oct 2007, 22:49
  #146 (permalink)  
Diaz
 
Join Date: Aug 2007
Location: UK
Age: 32
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I'm no expert, but I think if the pilot/ATC made a (big) mistake and they had to make a steep descent or quick deceleration, they can be extended to increase drag, but you don't see it done very often.
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