Downloaded from https://www.everyspec.com MIL-STD-810D 19 July 1983 ,. 1 ) In ‘a shipping/storage container or transit case’. .~.:1,.,.“” ~., ~~ .. : ( 2 ) Protectedor not protected. ,.. ~(3) Deployed realistically or with restraints, such as with openings that are normally oovered.! ,.. . . ,, g. ~. The test item should be so oriented with respect to the blowing sand that:the.most‘vulnerable surface(s) faces the blowing sand. The test item may be reoriented at 90-minute intervale. i, h. ,. (1) For blowing sand tests, 90 minutes Per face fS cOri~i!ered’ to “~~a . minimum (seeI-3.2g) . : . . . . .
(2) For blowing dust tests, 6 hours at 230C (73° F) and 6.houra at the high storage ‘oroperatingtemperature are required. Add~tionally, 9ufficient time must be allowed at the low air velocity to stabilize the test item at the higher temperature. . . NOTE: The period of time that the test item is exposed to the ‘environmental conditions may be as significant as the.conditions.themaelvea.,.The length of time.spent at the extreme condition of each procedure should be at leaat long enough to insure stabilization‘of the test item at’the.specified conditions’. 9 ,.. - i. ~. Operation of the test item during the test period should be based on the uae requirements of the specific test ,item.
For example, environmental control equipment would be operated while exposed to extreme ambient environments, whereaa certain equipment, although exposed to severe environmenta, might’be operated only in an environmental y.controlled shelter. If operation of the’test itemduring the teat is required by the requirements document, the teat plan shall contain a schedule describing the time periods of operation, the aettinga of controls, and the types and amounta of stresses to be placed on the test itemduring testing. Th$a schedule ehall contain at least one 10-minute period of continuous.operatiOn Or the test item during the last hour of the test. -!. , ., I-4.1 ~.
The failure of a test item to meet the requirement of the equipment specification must be analyzed, and related information must be considered, such aa: ,. ~-~ ~ . a. Degradation allowed in operating characteristics while at the extreme conditions. . b. Necessity for use of special operating procedures or special kits during extreme conditions. ., c. The teat item shall be considered to have failed the dust (fine aand) test when:’ . . METHOD 510.2 . 19 July ,1983 510.2-5 c..,.