
doi: 10.4271/730373
<div class="htmlview paragraph">The Air Force and the airlines have generally followed different aircraft engine maintenance concepts. This paper identifies some of the engine maintenance practices the Air Force has used in the past and how these practices are being improved to obtain engine on-condition maintenance. Reviews of the Air Force Spectrometric Oil Analysis Program (SOAP), Nondestructive Inspection (NDI) Program, and engine diagnostics efforts are presented.</div>
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