Downloaded from https://www.everyspec.com MIL-STD-81OD 19,Ju1Y’1983 e. ~. Review the equipment specification and requirementa documenta. Apply any additional guidelinea neceaaary. ~-~ .~ 1 1-4.1 l?ailure~. Based on the individual teat item and the require- ment for its leakage resistance, the following failure criteria apply: a. ~. Determine which of the following is applicable: the teat failure. (1) Unconditional failure. Any ‘evidence‘ofwater penetration into item enclosure following the inznersiontest shall be a basic for . (2) Accep~able w~ter penetration.
Water penetration of not more than IIcm~.per 28,000 om~ (1 fts) of test item enclosure 2/ shall be acceptable, provided the following conditions are met: (a) The water has no Iigediate’effect on the operation of the . teat item. (b) The teat item in its operational configuration (transit/atoraSe case open or removed) shall successfully complete the ihduoed temperature/humidity (procedure II) of method 507.2 for the geographical area in which it ie designed to be deployed. b. Failure of the test item to satisfy its func- tional requirements shall constitute an immersion teat failure. o c. ~. The test item must be safe to operate following the immer-” sion teat. I-4.2 a.
When testin~ a shipping/storage container or tranait case test items enclosed, all dunnage, packing, padding material, etc~, abaorb water shall be removed, if possible, before the teat. without the that may b. Extreme caution must be exercised when using the test item handlea, protrusions, etc., to Pull the test item under the water. This could produce unrealistic atress and leekage into the teat item. 1-4.3 rv of teat The following information is, required in the test plan for adequate conduct of the testa of section II: ., a. Test procedure number.
I 21 This quantity of water (4 cm3) is approximately the quantity required to raise the relative humidity of 1 cubic foot of air from 50% at 21‘C (70° F) to saturation at 49° C (120° F). The 49° C value is realistic for equipment exposed to high-temperature and solar-radiation effects. MSTHOD 512.2 19 Jllly1983 512.2-4