Failure Analysis of a Cracked UH-1 Tailboom Former, P/N 205-030-807-97

Report No. ARL-TR-3828
Authors: Scott Grendahl, Benjamin Hardisky, and Russell Yocum
Date/Pages: June 2006; 30 pages
Abstract: The U.S. Army Aviation and Missile Command sent the U.S. Army Research Laboratory Weapons and Materials Research Directorate a UH-1 tailboom former (P/N 201030-807-97) from the U.S. Army Kwajalein Atoll Facility (USAKA) in the Marshall Islands for investigation. The component was being investigated due to the presence of cracks observed near bolt hole locations on the part. This component was quality deficient report exhibit number M24H90327. The material utilized to manufacture the former was specified to be clad 2024-T4 aluminum alloy sheet in accordance with QQ-A-362. It was superseded by QQ-A-250/5B, which was subsequently cancelled, and superseded by the current specification for clad 2024-T4 aluminum sheet, SAE-AMS-QQ-A-250-5. The part was characterized through nondestructive inspection, chemical analysis, optical microscopy, scanning electron microscopy, and mechanical testing.
Distribution: Approved for public release
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Last Update / Reviewed: June 1, 2006