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Fuel Balancing


exnihilodub
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Thought there was a crossfeed on the tanks.

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Hi. The L/R fuel balance won't affect aircraft roll unless one side hits 0LBS. Expected behaviour or bug? Can anyone enlighten?

 

Fuel tanks are in the fuselage, not in the wings. They feed the Left and Right engine separately, but are actually Forward Cell (left engine), Center Cell and Aft Cell (right engine.)

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according to manual, the difference between aft and forward fuel tanks should be 200 lbs (roughly one tick mark apart). The balancing can be done two ways, either autobalance switch ON with both fuel pump switches on, or manually, by setting the lower tank pump to off then enable CROSSFEED, not autobalance. This is to prevent huge discrepancy from effecting CG changes that make landing difficult.

 

 

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The crossfeed allows one engine to be fed from other side tank. It’s no a fuel transfer valve for transferring fuel between tanks. I’m away and will have to check later though.

Correct, the fore (LH) and aft (RH) internal tanks can be topped up from the pylon tanks but not from each other. In fact the fuel diagram (T.O._1F-5E-1-1984_OCR, page 54) shows check valves that stop one tank filling the other.

 

I imagine it's to stop a damaged tank that loses all it's fuel, draining the other tank when crossfeed is used ?

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