Downloaded from https://www.everyspec.com MIL-sfD-810D 19 July ‘,1983 Step 4. Set the shock test apparatus to obtain a MaXiMUM acceleration (Am) and maintain the required velocity change below the anticipated failure level of the test item. If no information is available on anticipated failure. level, set the shock test apparatus to obtain a maximum acceleration level of 15 g’s. Pulse durations can be determined using the following relationship: v = SAM (0.9TD) , ~ ,. !, Step 5. Petform one shock test using pulse shown in figure 516.3-5. Step 6. Examine the recorded shock pulse to be certain the desired maximum acceleration (Am) and velocity change were obtained.
Methods for determining maximum acceleration and velocity change are.given.in step 3”above: Step 7. Examine or functionally test the test item to determine if damage due to shock has occurred. . If no damage has ooccurred, set the shock test apparatus for a higher maximum acceleration (Am) level while maintaining drop height (andthus velocity change).constant. Step 8. Step 9. For all.faces, repeat steps 5, 6, 7, and 8 with incrementally increaaihg maximum acceleration (Am) until teat item damage occurs. The maximum acceleration prior to Which damages occur is taken to be the shock-fragility level for the test item”in the direction tested. ,., II-3.4 Erocedure IV - Transit dro~ Step 1.
Install the test item in its transit or combination case as .. prepared for field use. Step 2. From paragraph I-3.6, determine the height of the drops to be performed, the number of drops per test item, and the drop surface. . Step 3. Perform the required drops using the apparatus of’paragraph 11-1.2. The drops should be in accordance wittitable 516 .3-II. It is suggested that the test item be visually and/or operationally checked . periodically during the drop test to simplify any follow-on failure evaluation that may be required. Step 4. Document the impact point or surface ‘“foreach drop and any obvious damage. step 5.
Following completion of the required drops,”visually,examine the .A test items(s). Step 6. Document the results for comparison with data obtained in paragraph II-2.2, step 2. ,- Step 7. Conduct an operational checkout in accordance with the approved test plan. Step 8. Document the results for comparison with data obtained in paragraph 11-2.2, step 5. MSTHOD 516.3 19 July 1983 \ 516.3-22