Failure Analysis of OH-58 Kiowa Warrior Drive Gear Shafts

Report No. ARL-TR-3827
Authors: Scott Grendahl, Victor Champagne, and Dan Snoha
Date/Pages: June 2006; 60 pages
Abstract: A 15-hp spare drive gear from a 250-C30/R3 engine on an OH-58 Kiowa Warrior failed in service, causing loss of AC power. The failed gear, all recovered teeth, and the driving pinion were sent to the U.S. Army Research Laboratory for investigation. This investigation focused on determining the mode of failure and any possible metallurgical or manufacturing contribution to this failure. Analysis included optical and scanning electron microscopy, chemical analysis, and measurements of hardness and surface finish.
Distribution: Approved for public release
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Last Update / Reviewed: June 1, 2006