SB6667A

Only thin-wall pins are subject of this SB. Heavy-wall pins which are used if you have higher compression are not affected.

If you engine was built from a Lycoming kit with order number 05K31541at an engine shop, you have heavy-wall pins and are not affected. If you have questions about your particular kit or engine, send email to Technicalsupport@Lycoming.com. They answer promptly.