Downloaded from https://www.everyspec.com 19 July 1983 MIL-STD-810D 11-3.1 Procedure I - Blow~ Steo 1. With the test item in the faoilitv and in its normal oDeratinR position; adjust the rainfall rate as specified-in the test plan. (~he seaied test item shall be heated to a higher temperature than the rain water (see I-4.2) and restored to its normal operating configuration immediately before testing.) Step 2. maintain for Initiate the wind at the velocity specified in the test plan and at least 30 minutes. Step 3. operated for If an operational check is required, the test item shall be the last 10 minutes of the 30-minute rain.
Rotate the test item to exmse to the rain source anv other side of the teat item that could be exposed SteD 4. t: blown rain in its deploy~ent cycle. Step 5. Repeat steps 1 through 4 accomplished. until all possible variations have been the test chamber, if possible; otherwise, remove the test item from the test facility and conduct a visual inspection. If a noticeable amount of free,water has penetrated the teat item, judgment must be used before operation of the test item. It may be necessary to empty water from the test item to prevent a safety hazard. Measure the volume of water. Step 6. Examine the test item in Step 7.
Measure and document any free water found inside the protected areas of the test item. step 8. If required, operate the test item for compliance with the requirements document. Step 9. Document the results. 11-3.2 Procedure II -. Step 1. Install the test item in the test facility in accordance with General Requirements, 4.5.2, in its operational configuration with all connectors and fittinga engaged. (The sealed test item shall be heated to a higher temperature than the rain water (see I-4.2) and restored to its normal operating configuration immediately before testing.) Step 2.
With the test item operating, subject it to water falling from a height of approxititely 1 meter (3 feet) at a uniform rate (as produced by a 75-mm-hish water level in the dispenser) for 15 minutes (see figure 506.2-1). The test setup shall be arranged ao that all of the upper surface gets droplets on it at some time during the test. Test items with glass-covered dials shall ~ be tilted at a 45° angle, dial up. Step 3. At the conclusion of the 15-minute exposure, i’emovethe teat item from the test facility and remove sufficient panela or covers to allow the interior to be seen. Step 4. Visually inspect the test item for evidence of water penetration. 19 July 1983 506.2-11 METHOD 506.2