Abstract
Condition monitoring through vibration measurement provides a route for detecting impending failure. However, it is only truly effective when combined with follow-up validating failure analysis to determine the root cause of the failure. Through detailed analysis of Health and Usage Monitoring Systems (HUMS) data, the Materials and Structures Group (M&SG), including the former AD AIM have successfully detected and diagnosed a damaged bearing within the engine transmission of an operational Chinook aircraft. Subsequent metallurgical analysis of the bearing, also performed by M&SG, revealed that a roller within the bearing was presenting a subsurface fault due to fracture that, if left undetected, was likely to have led to catastrophic failure of the transmission, significant secondary damage and airworthiness risk.
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