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Because the main case is at the heart of the Allison 1000, extensive tests are performed before it’s ever put into circulation on the assembly line. Stringent testing is applied to all parts. One of the tests it undergoes is an air pressure test, which ensures there are no leaks. Another test is performed at a sequential gauging station (shown). Here, a technician goes through a systematic process using gauges to make sure everything is within specification.