Downloaded from https://www.everyspec.com MIL-STD-81OD 19 July 1983 4.5.7 Mlure criteria. Failure of the test item to meet any one of the following conditions shall constitute a test item failure. a. Deviation of monitored functional parameter levels beyond acceptable limits established in 4.5.1 and specified in the requirements document. NOTE: Certain types of equipment (e.g., propellants and electrically driven devices) are often expected to demonstrate lesser performance at an environmental extreme, particularly low temperature. A failure would occur only if degradation is more than permissible. b. Nonfulfillment of safety requirements or the development of safety hazards. d c.
Nonfulfillment of specific test item requirements. d. Changes to the test item which could prevent the equipment from meeting its intended service life or maintenance requirements. (For example: Corroded oil drain plug cannot be removed with specified tools.) e. Deviation from &tablished environmental requirements. f. Other (see 4.5.8). 4.5.8, 1 &UJ.QQQa or different failure criter~. Any additional or different failure criteria shall be as specified in the equipment specification. 4.5.9 Environmental test reDort. An environmental test report shall be completed according to DID No. DI-R-7127. 4.6 .flimaticreaions.
For the purposes of this document, three climatic regions are defined to which equipment may be designed and tested: hotldry, hotlhumid (or !Ibasic”), and cold. 4.6.1 mu of c limatic reaio~. Figures 4a and 4b show land areaa where the various climatic regions exist. 4.6.2 D~.lim tati ~. t. tvDea. The climate types are distinguished primarily by temperature, and secondarily by humidity. a. Hot climatic re~i~. This region includes most of the low-latitude .. deserts of the world. During summer in these areas, temperatures above 43° C (110° F) occur frequently, but except for a few specific places, temperatures will seldom be above 49° C (120° F).
In winter, temperatures are likely to be in the same range as for the ‘Fbasic??climatic region. If materiel is designed . only for the hot climate, a specially tailored should be sought. Small portions of this area high absolute humidities, although the highest dewpoints do not occur at,the same time. low temperature design v~lue are sometimes subject to very temperatures and highest ----- 15