SLICK SERVICE BULLETINS
Additional returns of point contacts that exhibit accelerated wear in magnetos with low service hours, prompting the issue of this Service Bulletin. Typical symptoms are unusual RPM drop during magneto check, difficulty starting, rough running engine, and/or unstable point timing upon installation.
Champion Aerospace has identified a possible condition in the distributor gear assemblies of 4-cylinder magnetos that can lead to decreased service life. Some of the returned products contained distributor gears exhibiting loosening of the electrode finger. This condition was observed in magnetos with a varying number of service hours. Typical symptoms are unusual RPM drop during magneto check, difficulty starting, and/or rough running engines.
There have been limited reports in which impulse coupling stop pins have moved relative to the factory placement within the magneto frame of Slick magnetos. There has been one report of a liberated stop pin. A liberated stop pin could potentially enter the gear train of the engine, resulting in damage to the gear train, damage to engine accessories and could ultimately cause catastrophic engine failure.
There have been limited reports in which impulse coupling rivets have loosened relative to the factory placement. A loose or broken rivet could potentially enter the gear train of the engine resulting in damage to the gear train or damage to engine accessories and could potentially cause catastrophic engine failure.
This service bulletin has been updated to add the "TIO" engines to category 2 and make both alternative methods of compliance applicable to either category 1 or 2.
The Subject Matter Of This Service Bulletin Is Incorporated In Whole Or In Part In An FAA Airworthiness Directive. SUPSEDES SERVICE BULLETIN 599D FAA APPROVED. All TCM & Bendix S-20, S-1200, D-2000 and D-3000 series magnetos with riveted impulse couplings as installed on TCM, Lycoming, Franklin and other manufacturer's engines.
Supersedes SB643B TECHNICAL PORTIONS FAA APPROVED. The following information constitutes a portion of the manufacturer's Instructions for Continued Airworthiness and outlines required maintenance, inspection, cleaning and overhaul intervals for CMI (formerly TCM/Bendix) magnetos and related equipment for CMI engines listed under “Models Affected”. Reference X42003, “D-2000/D-3000 Series Magneto Service Support Manual” for information on these systems
DISTRIBUTOR GEAR MAINTENANCE. To emphasize the value of the use of correct materials and practices relevant to magneto distributor gears. All Bendix and TCM S-20, S-200, S-1200, D-2000, and D-3000 Series Magnetos
Supersedes SB669 TECHNICAL PORTIONS FAA APPROVED. Replacement and maintenance of the Continental Motors S-20, S-200, and S-1200 Series Magneto Distributor Block. To advise of availability of improved distributor blocks and to advise of updated maintenance and inspection procedures. During the next 500-hour magneto maintenance event, or at the next magneto overhaul, whichever occurs first.