Apparatus and method for improving liquid gaging system using error compensation data

A method for improving the accuracy of an operational fuel gaging apparatus previously installed on art airplane of the type having a plurality of fuel level sensors that each produces an output signal that corresponds to the fuel level at the sensor, which output signals can be combined to determine fuel volume accurate to within a first tolerance range, the method comprising the steps of:

• receiving the output signals from the, sensors;
• calculating a first volume measurement value based on said sensors output signals;
• detecting attitude of the fuel level relative to said sensors;
• storing, for a corresponding plurality of predetermined attitudes, a plurality of predetermined volume compensation data values based on repeatable errors in the volume measurement values that are a function of the fuel volume;
• and
• compensating said first volume value with said compensation data value selected for the detected attitude to derive a second volume value accurate within a second tolerance range that is more accurate that the first tolerance range.