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Thread: B747-400 QRH: "HYD CONTROL 1,4"
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Old 19th Jul 2016, 02:02
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Willit Run
 
Join Date: Jun 2001
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Sometimes it does; as on the classic.
The -400 can have either electric or air driven Demand pumps. United elected to go with all four powered by pneumatics. All the ones I have flown, Ex Malaysian, ex JAL, ex ANA, ex cargolux, have electrically powered demand pumps. That seems to be the Boeing norm.
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