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Old 26th Mar 2015, 20:39
  #1493 (permalink)  
giggitygiggity
 
Join Date: Oct 2009
Location: UK
Posts: 413
How do they know the FO started the descent without data from the FDR?
Air Traffic Control can see whatever altitude is set in the window from the ground (Mode-S?) and apparently, they would have seen it changed from 38,000ft (the cleared altitude) to 100ft.

My understanding anyway, if an ATCO want's to clear that up, be my guest.
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