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Aero Precision provides military aviation aftermarket solutions for c-130
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curious

Aux tank f/q increasing with airspeed

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If it appears fuel quantity increases with air speed with an aux tank, then there would be air flow pushing on the bladders of the aux tank.  When the bladder is compressed in this way, the fuel level seems to climb.  In a way, it does, since the actual level of the fuel rises. There is a panel inside the wing box that gives access to the inboard most bladder.  We have had this panel not installed once and the bladder crushed the fuel probe. I don't know if anyone is checking this post from over a year ago, but I haven't been here in a while.

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