Analysis of a Set of Failed Accelerated Life Test DMA Bearings

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Abstract
The DESPIN MECHANICAL ASSEMBLY (DMA) is that mechanism by which satellite antenna platforms are despun with respect to the remainder of the vehicle in order to permit data transfer as well as navigational command and control. A major component of this assembly is a set of DMA bearings. Because of the extended duration of most satellite missions, the DMA itself as well as the individual components undergo rigorous life and accelerated life testing. On occasion, a test article fails to meet the desired or anticipated performance level. This paper describes the analysis of a set of specially fabricated DMA type bearings which experienced such a failure during an accelerated life test. Physical, chemical and pictorial evidence is presented to support the postulated cause of failure.

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