Failure analysis of a helicopter accessory drive
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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.
Keywordsaircraft fatigue crack growth fretting vibration
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