Naval Aviation has redoubled its long-stand@g efforts to eliminate mishaps, especially those linked to human Errol. The focus was expanded not @ly to cover aircrew BIIOI, but maintainer error as well. To examine maintainer error, the Naval Safety Center's Human Factors Analysis and Classification System (HFACS) was adapted to analyze reportable Naval Aviation maintenance related mishaps (MRMs). A total of 470 MRMs for Fiscal Years 90-97 were analyzed. The HFACS Maintenance Extension effectively profiled the nature of maintenance errors and depicted the latent supervisory, working, and maintainer conditions that "set the stage" for subsequent maintainer acts that wae the proximate factors leading to a MRM. The profile and general findings held true for both major MRMs and less severe, reportable MRMs. 3-77s

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