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Thread: Fuel on Board Difference Calculation
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Old 2nd Jul 2010, 11:13
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Join Date: Aug 1998
Location: Ex-pat Aussie in the UK
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Not an "official source", but:

http://www.b737.org.uk/fuel.htm#Fuel_Gauges

The total tolerance for the FQIS system is based on a full tank. For example, if the fuel tank maximum capacity is 10,000 KG, then the tolerance of the gauging is 0.03 (airplane with analog indicators) * 10000 = 300 KG. The system tolerance is then +/- 300 KG at any fuel level within the tank.
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