To all owners and operators of Avco Lycoming Aircraft Engines.
As the use of spectrometric lubricating oil analysis has become more widespread in the field of general aviation, the problems of methods, procedures, schedules andinterpretation of data have become prevalent. This service letter is an attempt to clarify the subject and to define how lubricating oil analysis can be used as another tool in the maintenance of modern reciprocating aircraft piston engines.
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