The KC-135 airframe suffers from an aft Center of Gravity (CG). Boeing accounts for this aft CG by requiring that ballast fuel be carried in the forward body tank to maintain a CG forward of the aft limit. Boeing has analyzed the issue and states that 3, 500 lbs of fuel is to be left in the forward body tank strictly for ballast. Using fuel in the forward body tank for ballast has two significant drawbacks, the forward body tank has a very sho...
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