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Old 26th June 2009 | 03:49
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Intruder
25 Anniversary
Veteran: Navy
 
Joined: May 2000
Posts: 3,204
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From: Seattle
747 GE CF6: 4 minutes after start before takeoff. Depending on gross weight, can taxi with 2 or 3 engines running.

APU ~300 Kg/hr fuel; engine ~600-700 Kg/hr.

747 can either crossbleed start or run APU.
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