"Marshall islands." . . . . . . . . . . . . . . . . . . . . . . . . "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 It was superseded by QQ-A-250/5B, which was subsequently cancelled, and superseded by the current specification for clad 2024-T4 aluminum sheet, SAE-AMS-QQ-A-250-5.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."@en . . . "Failure analysis of a cracked UH-1 tailboom former, P/N 205-030-807-97"@en . . . . . . . . . . . . . "Military organizations." . . "Steel." . . "Microscopy." . . "Specifications." . . "Scanning electron microscopes." . . "Mechanics." . . "Nondestructive testing." . . . . "Electron microscopy." . . "Chemical analysis." . . "Mechanical properties." . . "Properties of Metals and Alloys." . . "Army aviation." . . "Failure(mechanics)" . . "Test and evaluation." . . "Cracking(fracturing)" . . "Army research." . . "Kwajalein atoll." . . "Inspection." . . "Optical analysis." . . "Helicopters." . .