To conduct a complete engine life test is a very expensive venture. What is used instead is the multipass test. Basically the filters are hooked up to a test stand and 6606 aviation hydraulic fluid is ran through them. 6606 is the standard test fluid. Then, basically a "puff" of test dust is added to the flow of a known particle distribution. A particle counter down stream analyzes the distribution of particles that gets through the filter. The filter is then subject to a series of these cycles (hence multipass). There is a single pass test, but it isn't quite as realistic. You'd be surprised how accurate the test is. If the threads on the tap plate of the filter are not formed right, you will see that leakage in the results.
So, the short answer is that standard tests have been created to normalize data collected from one filter to the next.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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