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Thread: B747 Back up Hydraulics
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Old 30th September 2008 | 04:54
  #37 (permalink)  
Earl
 
Joined: Jan 2003
Posts: 844
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From: USA
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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