Abstract
The investigation of the accessory drive failure of a Bell 47 G5A helicopter was completed. The bolts and dowel pins that fasten together the accessory drive gear and the accessory drive shaft failed. Failure occurred via a fatigue mechanism, with the physical root cause for failure attributable to insufficient clamping load in service, as well as other mechanical factors with respect to the connection.
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Kahle, V.E. Failure analysis of a helicopter accessory drive. J Fail. Anal. and Preven. 6, 38–43 (2006). https://doi.org/10.1361/154770206X117504
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DOI: https://doi.org/10.1361/154770206X117504