JOTP-011
5 December 2014
APPENDIX A. BACKGROUND/RATIONALE
ANNEX 1. ENVIRONMENTAL TESTS
packaged SRE is used for packaged tests and the unpackaged SRE for the unpackaged tests. In
the absence of this data, a value of +71 °C should be used in lieu of the SRE temperature since this
reflects the maximum value of the A1 Storage and Transit diurnal cycle defined in MIL-STD-810.
A.1-2 CLIMATIC ENVIRONMENT TESTS (APPENDIX C, ANNEX 1).
Provided below are rationale for the climatic tests. Select the test item configuration (packaged or
unpackaged) that exposes the munition to the most severe environmental condition. In most, but
not all cases, this is likely to be the unpackaged, bare munition configuration. Some munitions are
encased in a launch tube or container and packaged in a wooden or metal overpack shipping
container. In this case, climatic testing would be conducted with the munition in the launch
tube/container. In many cases, the shipping/storage container is the launch container (i.e., SLC)
and thus, would be the packaged configuration for all tests. Test the munition using the appropriate
packaging configuration (see Figure 2).
A.1-2.1 Humid Heat (Appendix C, Annex 1, Paragraph C.1-1).
The humid heat test is performed to determine the resistance of materiel to the effects of a warm
humid atmosphere. Materiel may be exposed to this environment year-round in tropical areas and
seasonally in mid-latitude areas. The procedure recommended by this document is an aggravated
test. It does not reproduce naturally occurring or service-induced temperature-humidity scenarios.
In order to reduce the time and cost of testing, the test item is exposed to higher temperature and
humidity levels than those found in nature; however, the exposure duration is shorter. A minimum
of ten test cycles has proven to be effective at inducing degradation/failures that are indicative of
long-term effects. For test items incorporating seals which protect moisture sensitive materials,
longer test durations may be required to obtain a higher degree of confidence that the munition
will remain S3 in warm-humid conditions.
A.1-2.2 Temperature Storage and Cycling (Appendix C, Annex 1, Paragraphs C.1-2 through C.1-
4).
Low and high temperature testing is carried as part of the sequential trials program in order to
induce thermo-mechanical stressing and accelerated ageing in the test munition.
A.1-2.2.1 Low Temperature Storage and Cycling (Appendix C, Annex 1, Paragraph C.1-2).
The low-temperature storage test is intended to determine the effects of low-temperature storage
on the munition. There is a 1 percent probability that ammunition deployed in arctic areas
(Category C3, MIL-STD-810) will be exposed to a temperature of -51 °C. Category C3 applies to
the coldest area of the North American continent and the areas surrounding the coldest parts of
Siberia and Greenland. The low temperature can be expected to dwell once reached with no solar
heating effects. A minimum of 3 days is recommended since this is considered sufficient duration
to thermally stabilize the munition. If, however, other cold temperature degradation mechanisms
A.1-3
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