Downloaded from https://www.everyspec.com MIL-STD-81OD 19 July 1983. .. Step 1. With the test item in the chamber, adjust the test “section ternperatuieto 23° C (T3° F) and the relative humidity to less than 30%. (Maintain less,than 30% relative humidity throughout the test.). Step 2. Adjust the air velocity to the required’value, determined from the test plan. Step 3. Adjust the dust feed control for a.dust concentration of 10.6 ~ 7 s/m3 (0.3 +.0.2 g/ft3). ,. ,1, Step 4. Maintain the’conditions of steps 1 through 3 for at least 6 hours. Step 5.
Stop the @st feed, reduce the test section air velocity to that required to maintain the olimitic conditions, and adjust the temperature to that determined from the test plan. . . Step 6. Maintain the step 5 conditions at least until stabilization of the test item temperature occurs”or for up to 16 hours. .,. . . Step 7. Adjust the.air velocity to that used in step 2 and restart the dust feed to maintain the dust concentration.as in step 3. Step 8. If required~ ,operatethe test,item in’accordance with the approved test plan. Continue the exposure for at leaat 6 hours. Step 9. Turn off all chamber controls and allo,wthe test item to return to atanda+d ambient conditions. ,.. . Step 10.
Reupye accumulated dust from the test item by.brushing, wiping, or shaking, taking care to avoid introduction of additional dust into the teet, item. Do not remove dust by either air blaat or vacuum cleaning. . Step 11. operate thi test item “inaccordance with the approved test ,. plan. Step 12. Document the,re,sults. Step 13. In~Pect the test item giving special attention to’bearings, grease seals, lubricants, etc. Step 14. Document the results. . II-3.2 e 11 - Bl~ .Step 1. Adjust,the chamber.temperature to the high operating temperature of the ‘testitem and maintain until temperature stabilization of the test item ia achieved. Step 2.
Adjust the air velocity to that required by the test plan. Step 3. Adjust the sand feeder to obtain the sand concentration specified in the test plan, depending upon the application of the test item. 19 Jldy 1983 510.2-11 MSTHOD 510.2