Downloaded from https://www.everyspec.com 19 July 1983 c. ~. (See Ge,neralRequirements, 4.4.4.) This method is applicable at any etage in the test program, but its effectiveness as a test method is maximized if it is performed after the dynamic tests. MIL-STD-810D The leakage test (method 512.2) is normally considered to be more severe than the rain test for determining the penetrability y of the test item. Equipment that pasaes the leakage test may not require exposure to the rain test if ite configuration is unchanged and the effects of penetration are the main.concern. . ~. This method is comprieed of three rain-related test procedures.
Before the test ie ccnducted, a determination muet be made of which test procedures and teat conditions are appropriate. Determination of related test conditions that are ueed during the test are based on: (1) The test item configuration. (2) The operational Durpoee of the teet item. 1-3.1 ~ ., a. k&AkW3W The primary cbjectivea of the rain teet are to determine if: (1) Rain can penetrate the enciosure of the test item while it is in its operational or storage configuraticn. o (2) The test item.can meet it? performance specification during and after exposure tc rain. (3) Rain causes physical deterioration of the test item. (4) The rain and collected rainwater removal systems are effective. b.
.SeleciOn of the test Drocedure t . Three teet prcceduree are included within methcd 506.2: blowing rain, drip, and watertightness. Select the procedure that preeents the mcst severe exposure anticipated for the test item. (1) -edure I - BIo~. Prccedure I is applicable for equipment which will be deployed.out-of:doors and which will .beunprotected from blowing rain. The accompanying wind velocity can vary from almcst calm to extremely high. Test items which cannot be adequately tested with this procedure because.of their large eize should be considered for testing under procedure III. . (2) re 11 -.
Procedure II is appropriate when equipment is normally protected from rain but may be exposed to falling water from &- condensation or leakage from upper surfaces. (3) l.c@@ure III - Wat~. Procedure III should be ooneidered.when large (ehelter-size) equipment is to be tested and a blowing- 0 rain facility .isnot available or practical. simulate natural rainfall but will provide a watertlghtnees of a piece of equipment. This procedure.is net intende~ to high degree of confidence in the MSTHOD 506.2 19 July 1983 506.2-3