PPRuNe Forums - View Single Post - 737 driftdown altitude - "Lt / Rt eng out"
Old 1st Jan 2010, 15:19
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FCS Explorer
 
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maybe because....

if you loose #2 than #1 bleed will have to supply BOTH sides wing AI.
but
if you loose #1 you can use APU bleed for that side and keep the isolation valve closed.
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