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Thread: Electric Aux pump B747-400
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Old 29th Nov 2014, 18:56
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bcgallacher
 
Join Date: May 2008
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Age: 80
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I may be wrong but I think that the Aux pumps can only be run on ground - the bus that powers them is not available in flight. The pump will also trip off if the system is pressurised by its ADP or EDP.
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