Downloaded from https://www.everyspec.com MIL-STD-81OD 19 July .1983 (1) Dust has penetrated the test item in sufficient quantity to oause binding or blocking of moving parts, nonoperation,of contacts or relays, formation of elect:ically conductive bridgea with resulting shorta, clogging, or the accumulation of dust which will act as a nucleus for the collection of water vapor. .. (2) The performance results obtained iriaccordance with.the test plan are not within the tolerance.limits established. ,. ,.. d. The test item shall be considered to have failed the large-particle test when: (1) Abrasion of the test”item exceeds the emount descr$bed in its requirements document.
(2) The test item does not perform safely or operate adequately as described in its requirements document. NOTE: The test plan shall contain procedures for.determining the test item’s degradation due to abrasion. These procedures shall ‘describeparameters (euch ae amount of wear or leas of weight) or observable attribute (euch as change of shape) which, if not within epecified limits, are indications that the test item has failed because of.abrasion effects. .The permissible tolerance of the parameters and attributes shall be provided.. ,,. The following information is conduct of the teats of section ., I-~.2 required in the test plan for the to adequate 11. ,., , a. Test procedure. . . . .
. . ,. .b. Test temperature. ... ... ,., ,. ,,. d. Air velocity. c. Relative humtdity. .-, e. Sknd or dust composition. ,,, . .. . f.. Sand or dust concentration. ,. s. ,Test item configurateion. ,.. h. Operational requirements. . .. . .. ... ... ,,, ., ~. Teet item orientation and time of exposure per,orientation. j. Additional guidelines. I-5 ‘IiEEEWW .,.., .. a. Hafer, Carl A., A Wvev and S&QsLvOf the’Factors W Affeet’the ver naurfaced errti Southwest Reeearch Institute, Contract DA-23-072-ORD-1210 final report.’ METHOD 510.2 19 July 1983 510.2-6