Failure Analysis of an AH-64 Main Rotor Damper Blade Rod End, P/N 7-211411186-5

Report No. ARL-TR-3100
Authors: Scott M. Grendahl and Marc S. Pepi
Date/Pages: December 2003; 60 pages
Abstract: The U.S. Army Aviation and Missile Command asked the U.S. Army Research Laboratory's Weapons and Materials Research Directorate to determine the probable cause of cracking of an AH-64 main rotor damper blade rod end, part number 7-211411186-5. The component secures an end of one of the linkages on the helicopter?s main rotor. The failure was noted while the helicopter was stationed in Seckenheim, Germany, on 10 June 1998. The investigation included visual examination, scanning electron microscopy, energy dispersive spectroscopy, hardness testing, chemical analysis, and retained austenite analysis. The analysis was conducted to evaluate whether the failure was an isolated event or part of an extensive problem in the fleet.
Distribution: Approved for public release
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Last Update / Reviewed: December 1, 2003