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27Hood, A. A., Fault Detection of a Full-Scale OH-58 A/C Helicopter Transmission, PhD Dissertation, Ph.D. thesis, University of Maryland, College Park, MD 20742 USA, 2010. 28Lewicki, D. G. and Coy, J., “Vibration Characteristics of OH-58A Helicopter Main Rotor Transmission,” NASA TP 2705 / AVSCOM TR 86-C-42, Vol. NASA 2705, 11987. 29Zakrajsek, J., Handschuh, R., Lewicki, D., and Decker, H., “Detecting Gear Tooth Fracture in a High Contact Ratio Face Gear Mesh,” NASA/TM-106822, Vol. ARL-TR-600, 1995. 30Mosher, M. and Huff, E., “Analysis of In-Flight Mea-surements from Helicopter Transmissions,” American He- liopter Society 60th Annual Forum, Baltimore, MD 2004, 2004. 31Tumer, I. and Huff, E., “Using Triaxial Accelerometer data for Vibration Monitoring of Helicopter Gearboxes,” 2001 ASME Design Engineering Technical Conferences, September 2001. (a) (b) (c) (a) (b) (c)
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