Champion Aerospace has released a revised version of Slick Service Bulletin SB1-15 recalling all 4300 and 4700 series Slick magneto distributor gears it manufactured with copper electrodes over eight years from September 26, 2008, through to September 1, 2016.
Champion has identified a condition in the distributor gears causing loosening of the copper electrode.
It has been reported in the US that the revised SB is a reaction to a product liability lawsuit alleging that a defective distributor gear in a Champion Slick 4370 magneto caused a 2015 crash that killed two men.
Champion changed the distributor gear electrode from copper to Monel in August 2016 following evidence that loose copper electrodes in these distributor gears can cause a loss of engine power,
Typical symptoms are unusual rpm drop during magneto check, difficulty starting, and/or rough running engines.
SB1-15A can be downloaded here