Downloaded from https://www.everyspec.com \ MIL-STD-810D 19 July 1983 b. ~. These regions include the most densely populated and heavily industrialized parts of the world as well as the humid tropics. The entire”.range of basic design conditions doea not necessarily occur in any one place. Each single condition (high temperature, low temperature, high humdity) occurs in a wide area. When taken together, the design ‘valueastiouldprovide for satisfactory equipment.throughout”the.aiea~ Tropical areas‘are included in this cli@iatetype because their temperature quite moderate, and their humidity’levels are equalled in the mid-latitudes.
The feature of the tropics most important for equipment destgn.is the persistence of high humidity over long periods of time. This conditicm not only promotes corrosion but ia an excellent enviro~ment for insect and microbiological damage. > c. Q&i and severe cold Climtic mziom. .- These areas include northern North America, Greenland, northern Asia, and Tibet. In the cold area, temperature during the coldest month in a normal year may be colder’than the b basic cold extreme of -32° C (-25’%?).
In the severe-cold areas, temperature during the coldest month in a normal year may be colder than the cold extreme of -46° C (-50° F), but colder than -51° C (-600F) no more than 20 percent of the hours in the coldest month of the coldest part of the area (northern Siberia, where absolute minimum temperatures as low as -68° C (-90° F) have been recorded). Because the extreme low temperatures are not controlled by a daily solar cycle, they persist for a long enough period of time for materiel to reach equilibrium at a temperature near the minimum. ,. 5. TEST METHODS Individual methods for environmental teating follow section 6. 5.1 6. NOTES ~.
The purpoee of this standard is to standardize the design I and conduct of testa for assessinz the abilitv of militarv eauinment to withstand environmental streaees it will enco~nter during”it; life cycle, and 6.1 to insure that plans and test results are adequately documented. 6.2 Mta re~.
When this standard is used in an acquisition, the data identified below shall be delivered only when the task paragraPh(s) applicable to a specific DID is applied in a contract and the applicable DID ie specified on the DD Form IU23, ‘Contraat Data Requirements List (CDRL).‘1 When the DD Farm 1423 is nat used and DAR 7’-lO4.9(n)(2)is cited, the data identified belaw shall be delivered in accordance with requirements specified in the contract or purchase order. Deliverable data associated with standard are cited in the following paragraphs. the requirements of this .
Para=raDh t& Data Reouire ment Title &,@&aJ21e R.lQ U.2.2.I Environmental Management 4.2.2.2 Life Cycle Environmental Plan DI-R-7123 . DI-R-7124 Profile Plan 4.2.2.3 Environmental Oesign Criteria DI-R-7125 and Test Plan Operational Environmental DI-R-7126 Verification Plan U.5.9 Environmental Test Report DI-R-7127 4.2.2.4 18