MIL-STD-1660A
5.4.2.2 Repetitive shock test rationale. This test is conducted to validate the reliability and sufficiency of the pallet base and the method of securing the load (strapping, netting, dunnage, etc.) in a worst case vibration environment experienced in transportation (especially in movement of tactical vehicles). For additional information, see A.1 of Appendix A.
5.4.3 Drop test. FIULs shall be tested by using the cornerwise-drop (rotational) test. All others shall use one edgewise-drop (rotational) test.
5.4.3.1 Edgewise-drop (rotational) test. This test shall be conducted by using the procedures of Appendix B.
5.4.3.2 Cornerwise-drop (rotational) test. This test shall be conducted by using the procedures of Appendix C. The drop test shall be applied once on each bottom corner. The height of drop shall be selected from table C-I.
5.4.3.3 Drop test rationale. This test is conducted to examine the ability of the unit load to withstand drops that could potentially occur during handling of the unit load by material handling equipment (forklift, movement by slings, etc.) in the transportation of the unit load. For additional information, see B.1 of Appendix B and C.1 of Appendix C.
5.4.3.4 Drop surface recommendation. The drop surface should be a minimum of 3 inches (75 millimeters)
thick and have a flat, smooth steel plate level to within 2 degrees of horizontal, possessing a Brinell hardness of
200-311. The steel plate should be of sufficient area to ensure that a dropped test item(s), including rebound(s), will be retained within its surface area. The steel plate should be uniformly supported throughout by a minimum thickness of 2 feet (60 centimeters) of reinforced 4,000 PSI (28 MN/m2) concrete or stronger. The drop test facility should be constructed such that no free water is retained on top of the steel plate. Any ice or debris should be removed from the impact surface prior to testing. Various guidance systems that do not reduce the impact velocity should be employed to ensure the impact angles; however, any guidance system should be eliminated at a sufficient height above the impact surface to allow unimpeded fall and rebound. The equipment should be checked at regular intervals for any degradation in its ability to provide a consistent, repeatable impact surface relevant to maximum weight and size of the test item(s). Existing drop test facilities consisting of concrete, faced with a steel plate, with a foundation 20 times the mass of the item being tested may be used for this test; however, construction of new facilities should be in accordance with the requirements above. These facilities should be constructed as soon as possible to ensure standardization of test facilities.
5.4.4 Impact test. This test shall be conducted by using either the procedures of Appendix D (Incline impact test), or Appendix E (Pendulum-impact test). Impact velocity will be determined by table II. The test shall be performed once on each of the four sides of the unit load. If the incline impact procedure is used, an optional timber shall be employed, which extends approximately 9 inches above the surface of the carriage.
5.4.4.1 Impact test (stacked). Unit loads likely to be stacked and shipped by railcar or flatbed trailer will be subjected to this test. The procedure will be identical to that of the impact test of 5.4.4 except that the unit loads will be stacked in the normal shipping configuration (typically two high). Dummy contents may be used. Unit loads likely to be stacked and shipped by railcar will be subjected to one impact on each end of the bottom unit load at
11.7 feet/second. Unit loads likely to be stacked and shipped by flatbed trailers only will be designed to pass one impact on each end of the bottom unit load at 5 feet/second. Evidence of failure of the connecting structures, which would permit any of the unit loads to become unattached, will be cause for rejection. In lieu of the stacked impact test, and at the option of the design agency, a rail impact test may be conducted in accordance with the requirements of the Association of American Railroads (AAR), Bureau of Explosives (BOE). Use MIL-STD-810, Method 516, procedure VIII.
5.4.4.2 Transfer-at-sea shock test(s). Unit loads planned for transfer-at-sea will be designed to withstand the shock test(s) associated with the appropriate mode of transfer as shown in table II. Following the tests, the unit load will continue to protect the contents and will not be damaged in any way that would prevent its use and continued safe handling.
Source: https://assist.dla.mil -- 1D3ownloaded: 2014-09-28T13:04Z Check the source to verify that this is the current version before use.
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