Downloaded from https://www.everyspec.com ./ . MIL-STD=8”1OD 19 July 1983 out-of-doors on land, the same test is applicable’for all such equipment. This test involves a 6mm layer of ice followed by a,13 mm layer of ice. For marine materiel which may be exposed to sea spray, a third thiokness of 75 mm is suggested. I-3.2 Choice of related test . condlt~. The test variables are configura- tion, temperature, rain rate, rain deliverymethod, droplet size, and wind velocity. The values chosen for the variables are primarily dependent on the intended use of the test item, and the level of severity’desired. a. Rura The foliowing factors”are to be considered:
(1) All equipment will receive icing on all sides and on top. (2) ‘EquipmentMUSt be in the corifighrationthat-it woild’be in when.deployed. If required, duplicate tests may be performed in the shipping or outside storage configuration. (3) Some equipment covered with ”icewill be expected to operate immediately without Cirst undergoing deicing procedures; other equipment would not be expected to operate until some form of deicing has taken place (e.g., Clearing windshields). (4) Ice removal will involve a combination of the built-in o ice-removal system together with expedient mesns which could be expected to be employed by military personnel in the field. .. ,,, b:
Test temperatures are recouimerided in the test procedure that may be used to produce the required’environmental condition:.” If extremes other thsn those shown are known, they should be used instead of the recommended values. ,, ., c. m de ~. erv rate ., The rain delivery rates ident.if$edin the test procedure are based on data used for previous testing (I-5a and b). These rates are considered representative of the spectrum encompassing both typical and worst-case conditions. Rain delivery rates are furnished as suggestions only. The objective is to produce a clear, uniform coating of glaze i’ce. Variations in.delivery rate that produce uniform coatings of glaze ice are acceptable.. .A d.
w del~d. Rain delivery in the form of a uniform spray can.be achieved by any of the arrangements described below: (1) Nozzle arrays directing spray to the top, aides, fron’t,and rear of the test item. + (2) Nozzle arrays that direct spray straight down onto the test” item. Sidespray coverage is achieved by using wind or a manual method. (3) A single, hand-held nozzle directing the spray over the surfaces of the test item. METHOD 521.0 19 July 1983 521.0-3