Fly Boomer Posted November 7, 2022 Report Share Posted November 7, 2022 Reading my AFM/POH weight and balance chapter (1989 M20K). Specifically, the part that tells me how to weigh the airplane and establish a new weight and balance baseline. It says to disconnect the fuel line at the boost pump outlet, and hook up a flexible line that will reach whatever container I am using to save the fuel. So far, so good. Now it says to use the boost pump to pump out all the usable fuel, leaving the unusable fuel. Then you pour 1.5 gallons of "unusable fuel" back into each tank. My question: Did the boost pump suck out all the fuel, leaving the tanks bone dry, thereby requiring that 1.5 gallons per tank be poured back in, or are we going to count "unusable fuel" twice? I thought the definition of "unusable fuel" was the fuel that remained after all possible fuel was sucked out by the fuel pump. Seems like this procedure (without explanation) specifies two kinds of "unusable fuel": 1) The kind that's left in the tank after the engine has sucked out all it can (engine quits) 2) The kind that you pour back into the tank after draining everything that can be drained with the boost pump. Mathematicians please check my work. Quote Link to comment Share on other sites More sharing options...
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