I Downloaded from https://www.everyspec.com I MIL-STD-810D 19 July 1983 O,. temperatures before use, procedure I is conducted before procedure II. If a manipulation test is required, procedure III can pr’ecedethe operational test. If the test item is not intended to be stored at low temperature or manipulated before use, procedure II is conducted directly. (3) lrocedure III - m~. Procedure III is used to determine the ease with which the test item can be set up and disassembled by personnel wearing heavy, cold-weather clothing. Storage testing, operational testing, or both can precede the manipulation teat if required. I-3.2 ~oi e of rela ted teat conditti.
After choosing the test procedure(s~, choose the test temperature, teat duration, teat item configuration, and any additional appropriate conditions. a. Tes t temDer-. The specific teat temperatures are preferably aelected from the requirements documents. If this information is not available, determination of teat temperature a) should be based on the world areas in which the test item will be used, plus any additional considerations. The information below provides guidance for choosing the test temperatures for: - Selected regiona. 8 - Worldwide use without extended storage.~ - Worldwide uae with extended storage periods. (1) Sse.
Table 502.2-I and the map in General Requirements, figure 4, can be used to determine the test temperature when the teat item is to be used at specific regiona only. The air temperature extremes shown in table 502.2-I are baaed on a frequency of occurrence of the houra during the most severe month at the moat severe location within the geographical area encompassed by the climatic region, except for severe cold, which is baaed on a 20 percent probabilityy of occurrence. The v+ues shown represent the range of the diurnal cycle. For this method, the lowest value in each range is usually considered. (2) mldwide use.
When the test item ia to be stored or operated throughout the world, temperature selection must include not only consideration of the abaolute cold, but also of the frequency of a given cold cOnditiOn. , Unless frequency is considered, it is possible to create an overtest condition. In terms of frequency, the probability-of-occurrencevalues shown below refer to the percent of total houra, in the most extreme month and area in the world, = ZI Extended storage is defined as etorage for 2 years or longer. METHOD 502.2 19 July 1983 502.2-4