Service Bulletin No. 637
Reprint of Slick/Champion Aerospace Service Bulletin SB1-19
March 14, 2019
All 4 and 6-cylinder Lycoming engines equipped with Slick 4300 or 6300 Series Impulse Coupled Magnetos.
TIME OF COMPLIANCE
Next maintenance event, or 400 hours total time in service of the magneto (whichever occurs first), then every 500 hours after the initial inspection.