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Low-pressure (altitude) chamber
tests are performed to determine if materiel can withstand, and operate in, a
low-pressure environment, and withstand rapid pressure changes. Examples of some
problems that could occur as a result of exposure to reduced pressure are:
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Rupture
or explosion of sealed containers.
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Change
in physical and chemical properties of low-density materials.
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Erratic
operation or malfunction of equipment resulting from arcing or corona.
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Overheating
of equipment due to reduced heat transfer.
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Failure of hermetic seals.
The Ranger is tested to 15,000 feet at
23 C (73° F) using Procedures I, II and III.
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