MIL-STD-1660A APPENDIX B
B.6 PROCEDURE
The specimen shall be placed on its bottom with one end of the base of the unit load supported on a sill nominally 6 inches high. The height of the sill shall be increased if necessary to ensure that there will be no support for the base between the ends of the unit load when dropping takes place, but should not be high enough to cause the unit load to slide on the supports when the drop end is raised for the drop. The unsupported end of the unit load shall then be raised and allowed to fall freely to the concrete surface or similarly unyielding surface from a prescribed height (see figure B-1). Unless otherwise specified (see 6.2), the height of drop for Levels A and B protection shall be in accordance with table B-I. The maximum heights shall not exceed 36 inches for Level A and 27 inches for Level B protection. Unless otherwise specified (see 6.2), a total of four drops constitute a complete test. If the size of the unit load and the location of the center of gravity are such that the drop cannot be made from the prescribed height, the height of the sill shall be increased. Rectangular unit loads shall be dropped once on each edge of the unit load base. Cylindrically shaped unit loads shall be dropped on the top and bottom rims at diagonally opposite quadrants. The quadrant pairs shall be separated by approximately 90 degrees. If a total of more than four rim drops is specified, the additional drops shall be on sections not previously dropped upon. If the test specimen contains materials which are affected by temperature, the test shall be conducted while the unit load is stabilized at the extremes of temperature. Unless otherwise specified (see 6.2), half the total number of drops shall be made at
-20±5 F and half shall be made at 140±5 °F. B.7 NOTES
a. This test is meant to simulate the impacts of accidentally dropping a unit load on its edges. It is intended
that the edgewise-drop test shall be used only on unit loads that are susceptible to accidental edgewise drops. The edgewise-drop test was designed specifically for large and/or heavy shipping containers or unit loads that are likely to be handled mechanically rather than manually. Details are given with the qualification, "unless otherwise specified", in paragraphs regarding:
(1) Conditioning of specimens (see B.5). (2) Number and height of drops (see B.6).
b. When the edgewise-drop test is performed to evaluate the protection provided for the contents, the rigidity of a dummy load should closely approximate that of the actual contents for which the packaging used within the unit load was designed.
Source: https://assist.dla.mil -- 2D2ownloaded: 2014-09-28T13:04Z Check the source to verify that this is the current version before use.
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