More than three bronze chips AND more
than three aluminum chips found in the oil
filter or oil suction screen
If the cause of the metal contamination cannot be identified, speak with the Lycoming Engines
Product Support.
If there is unusual aluminum, bronze, or iron contamination in the oil, make sure you have a full
description of the engine model, serial number, history, oil temperatures, oil pressure, unusual
performance, and properties of the metal contamination (color, size, metallic/nonmetallic, shape,
etc.). This information will help Product Support identify the cause of the contamination.
Coordinate with an appropriate oil analysis laboratory to have the material analyzed. For factory
new, factory rebuilt or factory overhauled Lycoming engines within their hourly or 12 year required
TBO cycle, if directed, send the oil filter element and metallic material to Lycoming Engines for
analyses.
A change in the usual wear rate of a part is not necessarily an indication of imminent failure. It is an
indication that a borescope examination, cylinder compression pressure check, etc. are necessary to
identify the cause for unusual wear.
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