Robert M. Gary wrote:
I have an IO-360-A3B6 with 1000 SFNEW in 1998. We pulled a cylinder
and the pin plugs where gone (we guessed this from the oil analysis).
The mechanic says he thinks he remembers some sort of SB put out by
Lycoming that there was a defect in the plugs and that they were made
too soft. Has anyone heard of such an SB???

http://www.lycoming.com/support/publ...fs/SI1492C.pdf

DB