Downloaded from https://www.everyspec.com MIL-STD-81OD 19 July 1983 @ METHOD 500.2 Low PRESSURE (ALTITUDE) U&e SECTION I I-1 PURPOSE . . ...... . . . . . . . . . . . . . . . . ...500.2-I I-2 ENVIRONMENTAL EFFECTS . . , . . . . . . . .,. . . . 500.2-1 I-3 GUIDELINES FOR “DETERMININGTEST c PROCEDURES AND TEST CONDITIONS . . . . . . . . . . . 500.2-1 1-4 SPECIAL CONSIDERATIONS . . I-5 REFERENCES . . . . . . . . . . ‘...,.. . . . . . . . 500.2-5 . . . . . . . . . . . . . . 500.2-5 . SECTION II II-1 APPARATUS . . . . . . . . . II-2 PREPARATION FOR TEST . . . II-3 PROCEDURES . ... . . . . . 11-4 INFORMATION TO BE RECORDED . . . . . . . . . . . . . . 500.2-7 . . . . . . . . . . . . . . 500.2-7 . .
. . . . . . . . . . . . 500.2-8 . . . . . . ..4. . . . . 500.2-9 SECTION I 1-1 ~. Low-pressure (altitude) chamber tests are performed to determine if materiel can withstand, and operate in, a low-pressure environment. 1-2 ~. Examples of some problems that could occur result of exposure to reduced pressure are: as a a. Leakage of gases or fluids from gasket-sealed,enclosures. b, Rupture or explosion of sealed containers. c. Change in physical and chemical properties of low-density materials. d. corona. Erratic operation or malfunction of equipment resulting from arcing or e. Overheating of equipment due to reduced heat transfer. , f. Evaporation of lubricants. g.
‘Erratic atarting and combustion of engines. h. Failure of hermetic seals. . I-3 NOTE: This teat method should be applied at the end of the tailoring process described in section 4 of this standard. \ 19 July 1983 500.2-1 METHOD 500.2