PPRuNe Forums - View Single Post - Jet goes down on its way to Medellin, Colombia
Old 29th Nov 2016, 18:47
  #65 (permalink)  
PEI_3721
 
Join Date: Mar 2006
Location: England
Posts: 857
eagle, # 62,
You are contemplating a situation involving failure of 4 engines or a combination of engines and the 4 independent power generating systems - no electrics, no hydraulics. Even then the battery should provide 30 min power, more with a dual option, enabling basic IFR flight; attitude, E2 compass, and pressure st by ASI and altimeter.

As DRUK explains above, flight control is not an issue.
IIRC Such a scenario was demonstrated during certification testing, ...
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