Aviation/Aerospace fuel capacity verification

Flow measurement under Military specifications require some of the most stringent spceifications our meters face.  To verify that the wing tanks being provided to the Air Force meet the capacity spec, the testing program includes a pump to fill, pump to empty test which twice verifies each tank's capacity.  A uni-directional test might overstate the fuel capacity of a tank, but a bi-directional test immediately verifies that no fuel was diverted or spilled in the filling test and double checks the accuracy of the tank’s manufacturing.
 
The design process of the F-15’s wing tank included a parallel design of the test stand which supports them.  The tank manufacturers are required to use the Max Model 242 flow meter in each test stand as these were the meters which certified the original prototypes and remain as the only allowable test standard for continuing production.  The Model 242 has the ability to measure bi-directional flow and produce a high frequency output to certify the total volume to within a few milliliters.   

Related applications:

Flow Meters for Aviation Hydraulic Fluids