Downloaded from https://www.everyspec.com MIL-STD-810D 19 July 1983 Step 5. Expose test item to endurance levels aa in I-3.2a. Step 6. Check test item for Requirements, 4.0. functioning in accordance with General Step 7. If test item is not a store, go to Step 10. Step 8. If free flight test levels as specified in I-3.2.2a and check in Step 9. is required, expose test item to acoustic . Step 9. Function store through,freeflight performance requirements. Step 10. Document teat as in 11-4. II-3.3 le teat,. Step 1. Using the guidance of II-2, mount the test item in test chamber. step 2. Position instrumentation aa given in II-2. Step 3.
Expose test item to the mission profile‘developedin 1-3.2.3.1. Step 4. During mission prcfile test, perform functional checks on the test item as required by General Requirements, 4.0. .Step 5. Conduct mission profile for desired number of missions. Step 6. During Step 5 testing, function Requirements. test item as given in General Step 7. Document test as in II-4. II-3.4 re IV nce tesii Step 1. Conduct pretest inspection (reference II-2). Step 2. Suspend the test item in the chamber so that only the cavities to be tested are subjected to direct impingement of acoustic energy. Protect other surfacea of the item so that sound pressure levels are at least 20 dB lower.
Protection devices shall not damp test item vibrations. Step 3. Position a microphone in the cavity to be tested. The microphone shall faoe outward so that ita face can be seen when looking down into the cavity. . Step 4. Perform resonance dwells at significant cavity resonances. The response of the microphone mounted in Step 3 shall be :3 dB of the levels required by I-3.2.2a. Resonance dwells can be done individually or simultaneously. Verify functioning of test item during acouatic exposure. Step 5. Conduct post-test inspection. Step 6. Document as given in II-4. 19 July 1983 515.3-15 MRTHOD 515.3