Old 04-30-2009, 02:26 PM
  #11  
joepilot
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Joined APC: Jul 2008
Position: 747 Captain (Ret,)
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All the airplanes that I know about that have a dump system make it physically impossible to dump all the fuel.

The ones that I have flown leave an undumpable quantity of 1 to 2 hours of cruise fuel consumption.

Joe
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