As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INVESTIGATION OF MAGNETO FAILURE FOUND THAT THE CONTACT ARM OF THE PRIMARY POINT SET HAD SNAPPED OFF. THE BREAK OCCURED AT THE AREA WHERE THE STIFFENER FLANGES FLATEN OUT. JUST AT THE EDGE OF THE NYLON BLOCK. UNABLE TO DETERMINE CAUSE OF FAILURE. (AL05200402443)