As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALUMINUM MAGNETO DRIVE COUPLER FRACTURED CAUSING ENGINE STOPPAGE IN-FLIGHT. PART USED IN EXPERIMENTAL AIRCRAFT FOUND TO HAVE AN APPROX 200 HOUR USE. RECOMMEND REMOVING ALL IN SERVICE AND REPLACE WITH THOSE MADE FROM PHENOLIC OR MICARTA (NOT SURE WHICH MATERIAL NOW BEING USED BY GREAT PLAINS AIRCRAFT, NEBRASKA). DID FIND OUT THE PART MUST NOT BE MADE FROM ROUND STOCK (DUE TO GRAIN), BUT CUT AND SHAPED FROM FLAT STOCK.