Downloaded from https://www.everyspec.com MIL-STD-81OD 19 July 1983 a. ~. ~. This method is intended to be used for the following applications: (1) Air shipment of materiel in cargo aircraft. Equipment designed for installation or operation at high ground elevation~~) (3) Explosive (rapid) decompression due to aircraft damage. b. &2atrictioM. This method is not intended to be used to test equipment to be installed in and operated in aircraft, missiles that fly at high altitudes (i.e., above 4 ,570m (15,000 ft)), external stOres, Or space vehicles, since such equipment would be subjected to method 520.
This altitude test would be a duplication of effort and a less effective test for such equipment. c. ~. (See General Requirements, 4.4.4.’) Thie method is considered to be the least damaging of those included in this document for most typea of equipment and therefore may be one of the first to be conducted. Other teeting may contribute significantly to the effects of low pressure (see I-2) on the test item and may have to be conducted before this method. For example: (1) Low-temperature and high-temperature testing may affect eeals. (2) Dynamic tests may affeet the structural integrity of the test item. d. Test variatio~.
Before conducting these tests, determine any required variation of the test procedure(s). The choices for varying the test procedure(s) are extremely limited. The primary variations involve the test altitude. altitude chanRe rate. and test duration, aa outlined in I-3.2. Other environmental combinations, such as low temperature and low pressure, addressed in this method but may be considered. are not I-3.1 -Choiceof DrOCedUre(a> test a. fme rational DU rDose of the test item. From the requirements document(a), determine the functions to be performed by the”equipment. low-pressure environment and any limiting conditions. in a Tes obiectivea.
The”primary objectives of the low-pressure (alti~~de) t~st are to determine if: (1) The test item can sites. be stored and operated at high ground elevation .(2) The test item can shipping/atoiage configuration. be transported by air in its normal ,. (~) The test item can determine if it will damage the survive a rapid decompression and, if not, to aircraft or present.a hazard to personnel. METHOD 500.2 19 July 1983 500.2-2