MIL-STD-1660A APPENDIX C
C.6 PROCEDURE
The specimen shall be placed on its bottom. One corner of the base of the unit load shall be supported on a block nominally 6 inches in height, and a block nominally 12 inches in height shall be placed under the other corner of the same end. If the dimensions of the unit load are such that the 12-inch height cannot be attained without instability, a block of the greatest attainable height shall be substituted. These heights 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 be raised so that the lower corner of that end reaches the prescribed height,
and then allowed to fall freely to the concrete surface or similarly unyielding surface (see figure C-1). Unless otherwise specified (see 6.2), the height of drop for Levels A and B protection shall be in accordance with table C-I; the maximum heights shall not exceed 36 inches and 27 inches, respectively. Unless otherwise specified (see 6.2), there shall be one drop on each corner of the unit load base (four drops). If the test specimen contains materials which are significantly affected by temperature, the test shall be conducted while the unit load is stabilized at the extremes of temperature. In this case, one drop shall be made on each of two diagonally opposite corners at
-20±5 °F. The test specimen shall be allowed to come normally to room temperature prior to conditioning at the other extreme. One drop shall then be made on each of the other two diagonally opposite corners at 140±5 °F. Thus, a total of four drops constitutes a complete test.
C.7 NOTES
a. This test is meant to simulate the impacts of accidentally dropping a unit load on its corners. It is intended that the cornerwise-drop test shall be used only on unit loads that are susceptible to accidental cornerwise drops. The cornerwise-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 C.5). (2) Number and height of drops (see C.6).
b. When the cornerwise-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 -- 2D6ownloaded: 2014-09-28T13:04Z Check the source to verify that this is the current version before use.
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