Supersedes Service Bulletin No. 583
July 21, 2008
All Lycoming new, overhauled, rebuilt, or repaired engines with:
1. A Slick model 4300/6300 series magneto with a serial number beginning with 0610#### through 0804####.
2. A LASAR model 4700/6700 series magneto with a serial number beginning with 0610#### through 0804####.
3. Any magneto which has had the cam, or the cam as part of the contact point assembly kit, replaced between October 1, 2006 and May 11, 2008.
TIME OF COMPLIANCE
Within the next 50 hours of engine operation. Then at every 100 hours of engine operation or at annual inspection, whichever comes first.
Lycoming has learned that all new, overhauled, rebuilt, or repaired engines with a Unison Industries Slick model 4300/6300 series or LASAR model 4700/6700 series magneto with the serial number range listed above may experience premature wear of the breaker point cam. Premature cam wear can cause excessive timing drift which may lead to low magneto output power.
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