What was found
DURING 100-HOUR ANNUAL INSPECTION, MAGNETO TYPE BENDIX D2000 SERIES REMOVED FOR CONTACT BREAKER REPLACEMENT AND INTERNAL TIMING CHECK. MAGNETO REFITTING WITH LYCOMING GASKET P/N 62224 INSTEAD OF LW-12681. THE MAGNETO BECAME LOOSE AND BACKED OFF FROM THE ENGINE DRIVE. THE ENGINE STOPPED IN-FLIGHT AND THE AIRCRAFT WAS FORCED TO LAND ON A NEARBY AIRFIELD. THERE WAS NO DAMAGE OR INJURY SUSTAINED TO AIRCRAFT OR PERSONNEL.