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Old 27th Feb 2011, 11:53
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Bullethead
 
Join Date: Nov 1999
Location: East side of OZ
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G'day bugsquash1,

Unlke the older B747s the B747-400 can pressurise all four hydraulic systems before engine start and complete the control check before pushback. This is standard procedure for QF. There is a combination of engine driven pumps, air driven pumps and electric pumps to pressurise the various systems.

Regards,
BH.
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