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Thread: B747 Back up Hydraulics
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Old 30th Sep 2008, 04:54
  #37 (permalink)  
Earl
 
Join Date: Jan 2003
Location: USA
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Some 747 classics have a electric pump for number 1 system also, I think the old JAL classics had this and a few others.
Both the number 1 and number 4 electric pumps get there power from the ground handling bus and cannot be powered in flight.
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