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Old 15th Aug 2017, 11:51
  #7 (permalink)  
Join Date: Jun 2001
Location: OZ
Posts: 1,010
Wiggy is correct. The B747 series has Engine Driven Pumps and Demand Pumps for each of 4 systems. If any engine is shut down and the DP is armed, it will run and all 4 hyd systems are powered. Beware of monkeying around without DPs - it bites. Taxi on 3 is quite normal and the decision on which inbd engine to shut down is influenced by the direction of turn onto the bay.
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