This test is used to evaluate the durability of the swivel mechanism of the sample due to repeated swiveling over a long period of time. For samples that swivel 360 degrees, one revolution is one cycle. For samples that turn less than 360 degrees, one cycle will be swiveling from one stop to the other. A dead weight load of 250 lb. will be placed in the seat during the test. The sample will be subjected to 120K cycles with a cycle rate of 15 cycles per minute.