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Mode of Failure Investigations of Helicopter Transmissions

机译:直升机传动失效调查方式

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This report presents the results of the engineering review and analysis of failed parts rejected during UH-1 and CH-47 transmission overhaul at aradmac. The analysis included metallurgical and metrological examinations, the identification of failure modes, the computation of operating stresses, and the correlation of calculated with observed component lives. Tribological considerations were employed in the identification of failure modes and extensive use was made of special computer programs in the generation of failure data and the correlation studies. The study revealed that overhaul life is limited by a few parts whose failure rates exceed the mean by an order of magnitude. Areas of needed research and development to improve design capabilities are identified. (Author)

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