What was found
MAGNETO WAS INSTALLED AS A NEW UNIT WITH STC SE419CH ON THIS AIRCRAFT ON 4-28-97. THE STC IS THE UNISON ELECTRONIC IGNITION SYSTEM. DURING THE MAG CHECK WITH THE ENGINE RUNNING AND THE MAG SWITCH IN THE LEFT POSITION, THE ENGINE QUIT. OPERATION WAS NORMAL IN RIGHT MAG OR BOTH POSITIONS. AFTER CONTACTING UNISON, THEY SENT A NEW MAG AND SUGGESTED CHANGING THE UNIT OUT. AFTER THIS WAS DONE WITH A NEW MAG, THE OPERATIONAL CHECK OF THE SYSTEM WAS NORMAL. THE UNSERVICEABLE MAG WAS RETURNED TO UNISON.