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Old 15th Aug 2017, 04:32
  #4 (permalink)  
Join Date: Nov 1999
Location: UK
Posts: 1,600
I don't know where my copy of "Flying the big jets" is, with its schematic of a 747 classic hydraulics, but I am guessing there are no PTUs or Electric Hyd pumps to maintain systems when engines are shut down?

On the A320/321, we run the elec yellow hyd pump to keep systems alive during single engine taxi.
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